If you know how to do handy work, and can do stuff like painting cars/bikes and stuff.
Then I think it would be easy to restore this on you'r own.

Take the case apart, and clean it for dirt and dust at first.

For the yellow plastic, use some retro bright and for the metal parts, then sand it down.

For the cover. Prime it with some standard metal primer and paint it white again.
(if someone knows how to make that sawdust effect, it would look even more retro)

For the non-painted part of the case, you can perhaps do a cool colour (deep red or something)
Or just remove the rust gently with an metal sponge and finish it off with some clear coat.

I'd go about it much as Brostenen suggests.

Retr0bright after a good cleaning in some heavy duty detergent for the plastic parts.

Sand down the rust on the painted parts, keeping as much of the original paint as possible. Powder coating is extremely durable, and makes a very good primer. Thoroughly clean it all. Then spray paint it all with several thin layers of paint as close to the original color as possible. Since the rust spots are so small, there's no real need to use any primer there, but you could do it if you like. Getting an even coat on large flat surfaces is hard, and takes time and some skill. If you don't have previous experience, you might want to practice on a metal sheet or something first. Also remember spray paint can caps can be replaced, ask for caps suitable for the job (read: large, flat surfaces) where you buy the paint.

The "sawdust effect" Brostenen talks about can be achieved by keeping the distance when spraying, and painting in many, extremely thin layers, which you give time to dry thoroughly between sprayings.

As for the non-painted parts, remove the rust with a coarser paper, and then sand the whole surface with fine (800-1200) grit paper to get an even look. Then give it a coat with clear spray varnish. Matte varnish is preferable if you can live without a glossy finish, it's a lot more forgiving.

brostenen wrote:

(if someone knows how to make that sawdust effect, it would look even more retro)

That's merely an effect from holding the spray pistol at a distance that is not optimal for a smooth paint layer (look up "orange peel effect"). Certain paints are also structured, so after application they have a grit-like appearance.

First, use this stuff to whiten the case. It's basically 40% Hydrogen Peroxide in paste form, Retro-bright in a bottle (careful, it works fast. Experiment on a small corner first, or maybe on an old keyboard or mouse). This should take care of the plastic
http://www.sallybeauty.com/creme-developer/SL … e+cream&start=2

Second, Paint stripper. Its nasty, but it's the best way to get rid of all the old paint, and will clean it right down to the bare metal. Take all precautions when using it though.

Finally, once everything is cleaned and sanded, use the lightest primer you can find. Remember that it will affect how the paint looks, so if you use a dark primer, then the final paint will have a darker hue, and vice versa. Also get a matte paint, as gloss will look very unprofessional

Those are my thoughts on the subject. Hope they help!