In the first photo all the parts at the top of the photo are Z02-03 channel parts. Don't look like channels? If I got them preformed from Sonex they would be long 4' and 8' lengths of channels. I can't bend that kind of stuff, so I cut the right width from .032 sheet, and I'll bend them individually into channels (or angles; some channel pieces only use the flat and one leg, so not a channel any more).
Channel parts up top; misc parts below
Patterns before pasting on metal
Hard to see, but patterns pasted on metal, then cut w/ shears
