Alright, so I've gotten further with my plate reverb. My dad was able to get pipe and right angle joints from his work, and we purchased the 28 gauge sheet metal. It needs to be cut to the same size as the pipe-joint structure. It also needs to be reinforced on the corners so that when I stretch it out to be held in the structure, the corners don't rip.
I ordered the piezo pickup, but it's coming from China so it'll still be like a week.
Still to buy:
-efficient speaker
-pre amp (might have old one sitting around)
-recovery amp (")
-heavier metal for corner reinforcing
-hooks to fasten plate to structure
-some way to stand the structure up
Cheers,
Landon