After seeing a number of people talk about making these on various sites and forums I decided I should try my hand at one. It's made out of a Radica electronic game that is unfortunately no longer being made but occasionally you can find one buried in a Toys R Us, at flea markets or trusty old Ebay. There are two versions of the game, one for tanks and the other for subs though they're essentially the same thing.
I picked up some parts at the hardware store including black and white spraypaint, a slip joint nut and some window tint. Various other greeblies were added on from my bits box. The strap is some thin rubber weather stripping I had laying around. The game even still works.