I doubt putting a computer into a wet suit will be easy, certainly not a three-week project. Wet suits (by definition) are water-permiable (hence the name) and keep a layer of water between the body and the suit, in the interest of creating insulation. You'll have to water-proof all the components first.

Well... unless you don't plan on using it in the water, at which point I would question using a wet suit. I'd probably go with long johns myself. Just my thoughts.