yeah, the act labs tv lightgun should work well for you, and they were just discontinued, so it will be a little tough to find some, but they wont cost as much as the pc lightguns from the same manufacturer. the pc version sells for over 200 dollars each right now.
as for the sides, if you can afford it, formica would be the best thing to do, but painting would come in a close second, and is usually cheaper. as for contact paper, that sounds a little too cheap.
and the decals, you should get them to stick well on gloss or even semigloss paint well, and formica is usually just like countertop material, so you should have no problem there.
good luck.