Ok, so I've been thinking for awhile about putting together a full-size cab for my sister's family, and a couple months ago I came across a solid, generic cab for cheap ($10

)that might be the foundation of that project (it was a Johnny Nero Action hero). Anyway, it would probably end up living in their unheated garage (in central Indiana) exposed to below freezing temps in the winter nights and serious heat and humidity in the summer. My bro-in-law does a lot of classic car restoration in his garage with his buddies so I know it would get played whenever the garage is a tolerable temperature.
As far as internals, what would be most temp-proof? Monitor will likely be a TV, and I would really just focus on classic games (if I could get Ms Pac, Galaga, and DK going that'd be fine). Anyway, anyone built a cab they knew would be in a bad environment and have tips for me? Worst case I could do a plug-and-play TV game (which was the basis of the last mini cab I built them), but would a cheap multiboard be the right kind of choice here?