I dont do alot of scratch building but when I do I use stuff like .030" to .040" plastic sheets, you can get these sheets from .010" to .060" thick?, also it comes like 6"x12" sheets, you can get at some ace hardware stores, they stock some good stuff there, aluminum tubing, for scratch building distributors sizes like 1/16"X .014 stock number 8100, 1/8"X .014 stock numbern 8102, 3/32"X .014 stock number 8101, and for the wire I use from radio shack, stock number 278-502, insulated wrapping wire, 30 gauge solid core, 50' it comes in red, white, and blue, and you can paint the white wire, you can also use old dead computer mouse wire for detail, and even some old electronics, jewlery files, i found at Ace Hardware too, there super fine, mine came with 6 files and a handle i think stock number is 707-011, pin vice, and micro drill bits, starting from 61-80, or if you like .039 to .0135, i got both offa ebay for like 9 bux,
Well I hope this helps you out a lil, the stuff I mentiond can be used for different things, just gotta play.