The Revell kit in 1/32 scale of the Mirage III was issued long ago in 1975 and appeared in various kit boxes. The basic shapes are all there in the grey aluminium coloured plastic with mostly raised panel lines. You get an engine to be fitted into the fuselage and a selection of stores with fuel tanks, bombs and missiles. All parts are rather basic and crude in some areas like the missiles.
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Recently, the some kit popped up as Revell re-issued it in several boxes like the Belgian memphisto scheme (on the left). It also came in a traditional box (# 00185-389N) seen on the right; this last kit one comes with superb decals for not fewer than 9 planes of 3 airforces:

French AF Mirage IIIE , 2e escadre ALSACE 1965 (camo)
French AF Mirage IIIRD, 33 escadre reconnaissance, MOSELLE, 1965 (camo)
French AF, Mirage IIIE, 3/3 escadre ARDENNES, Nancy 1974  (camo)
Swiss AF, Mirage system test plane, 1968 (metal)
Swiss AF, Mirage IIIRS reconn, Fliegerstaffel 10, Lucerne 1969 (metal)
Swiss AF, Mirage IIIS, 16 squadron, Buochs, 1969 (metal)
Swiss AF, Mirage IIIRS, 10 squadron, Payerne, 1990 (camo)
Australian AF, Mirage IIIO no 79 squadron, RAAF Butterworth Malaysia, 1988 (camo)
Australian AF, Mirage IIIO, no 79 sq, RAAF Butterworth Malaysia, 1988 (splittern pattern)

Instructions of Revell are quite good and typical of the age with some colour info. Colours given are generic in nature and color info. 

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A couple of models will be made of this kit.

[1] First I selected to make an Australian test Mirage IIIO of the ARDU (Australian Research and Development Unit) test squadron based in Edinburg Australia 1985. This plane has some special modifications like camera windows in the nose. It sports an attractive white and orange livery. 

[2] The other Mirage IIIE model will be made in parallel and will be for a traditional French Air Force Mirage in metal finish with red detail markings. Obviously this must simply be in the collection as you may remember seeing this life or in many pictures in the past! (I will try to make a model of the French AF of EC 2/13 ALPES as based on Colmar in 1965; this means I have to search for decals or make my own). 

 

Lets look at the kit now to create the models [1] and [2]

STEP 1
Engine
The kit comes with a simple engine. I installed the engine only to get a long exhaust pipe, but used only half the pipe length. Prior to installation, I added some details at the afterburner. The rear part of the fuselage needs some sanding to get a smooth result. 

Although the exhaust itself is a bit simple, I will use it and use various metallic colours here. Alternatively you may buy an aftermarket set that provides you with more details on the insides on the exhaust. If you make a Mirage IIIO, it may be an idea to get a F-104 engine exhaust from another kit.

STEP 2
Cockpit
The kit's cockpit and the ejection seat is very basic. I got a resin replacement seat from High Planes (kit AC3201). The seat looks very similar to a Martin Baker seat as found in many Hunters. 

The edges on the cockpit sides were made thicker with plastic card. The instrument panel was made from card and I will use home made instrument decals to add detail. Also I added detail onto the side panels like a throttle. The rear bulkhead was also a bit detailed. Overall, the cockpit is small and pretty dark, I used "tyre black" in most areas. 

STEP 6 
Fuselage assembly
I made an internal "tunnel". This was an effort that turned out not really needed.

The nose is a separate part and does not fit well. I needed to do a lot of sanding to get a smooth and symmetrical result. (Revell supplies you with parts for an extra option for a recon camera nose). The fuselage joints needs putty and you will need to remove some ejection pin marks. 

Intakes are a bit simple. I added the supports between the backing plate and the fuselage. Also, the back of the triangle lip was covered with card and putty. 
The cockpit area, will be detailed later on.

The lower fuselage needs quite some filling...

NOTE: 
1/   For model [2] typical of most Mirages in step 14  the doppler radar part # 88 was used. The ARDU plane (Model [1]) has a smaller antenna fairing. Some plastic card was added here (and not part 88) as seen below:

2/   I also drilled open a small hole in the starboard lower fairing at the tail of both models. Revell indicates this as decal #A39.

STEPS 3-5 
Undercarriage
The wheel legs need more detail and look at real pictures to improve them. The wheel wells cry for detail. I added various pieces of card and sprue. On most Mirages the doors actually are open when they are on the ground. 

STEP 7-10 Stores
Assemble the stores you want to use. (I haven't seen the bomb configuration as shown in step 8 on a real Mirage, but maybe it has been used)
The crude Magic missiles  looking like " Sidewinders " are best replaced!

STEP 11 Nose
Not needed is the recon nose; the normal nose doesn't fit very well. For the model [1] of the ARDU, I drilled open 2 holes on both sides on the nose and added a small open scope fairing under the nose tip. I assume that some camera's are equipped in the nose.


STEP 12
Vertical tail + WIngs
The tail seems OK for the versions to be build. I know that on some kits (eg Mirage V) Revell added a correct vertical fin with a leading edge extension at the base as seen here...... 

There is a need to droop down the wing trailing edge flaps as they droop down for a plane on the ground. I simple made some cuts and scored the panelline and than bended down the flaps. When you fit the wings, you will end up with large gaps on the lower sides. Add card and plenty of putty here. 

STEPS 13-16
Leave these for after you painted the model. 

STEP 17
Adjust the flap fairings as you drooped the flaps; make cuts, sand off and glue at an angle.

DECALS and FINISH
Prior to colour finishing, the overall model (below here model [1] is seen) was given a light grey coat to check for any flaws

Model [2] was given after correcting the flaws with putty, an overal metal coat using ALCLAD II Metalizers. I used "highly polished aluminium" on the majority of the airframe surfaces and darker titanium in smaller areas. 

There are not that many different metal colours on the real Mirage III, masking was very limited and so this can be relatively quickly done. Buffing the coating will give a noce shine to it.

Model [1] got the orange scheme of the ARDU test flight. After the white satin colour (using Humbrol  #130 ), the orange split pattern was masked off using Tamiya tape and the orange airbrushed using Humbrol  #18. 
Next steps are putting on the decals and details etc.

To next Mirage [ page 2 ] .....
 

Mirage V, Lock on no 11, Peeters 
particularly for detailling (there is much common between the III and V) 

Modelling the Australian Mirage IIIO, Alan W.Hall 
Airfix magazine July 1969 

IPMS Belgium, KIT 54, 1984 
with drawings 

On the internet: use Google to search! plenty of stuff!

such as Walk Around Swiss Mirage IIIS:
http://www.master194.com/photo_avion/mirag...uisse/index.htm