I want to try making a stool based on this video series by Paul Sellers. Unlike Paul, I will use some power tools (power drill, oscillating tool for sanding/cutting, maybe rotary tool for sanding). Also I don't have a plane or spokeshave. I'm planning to use saw, chisel and a lot of sanding to smooth out the wood instead of planing/shaving.
I also don't have such nice wood on hand. I have a scrap piece which appears to be made from boards glued on a plywood, with some veneer as well (the veneer won't make it into the project). As you can see there are cracks and it's not in the best shape, but this stool will likely see abuse anyway, so I don't care if it looks rough. My question is, will the stool break during use in a dangerous way if I use this wood?
I tried suspending the wood with the plywood side down, and two blocks below the short edges, then climbing on top of it and pumping my legs. I'm 170 lbs and a decently good pumper. The wood buckled, perhaps by about 0.25-0.5", but didn't break or make sounds.
The wood is 1.148" thick, and 16" x 22". I can only guess at its original purpose, I found it by the dumpster.