I agree, Ty - I had guessed that Joe was building that one to sell, but I'm probably wrong. If I look at that TAC project as a fun one, it looks very much like something I'd do, if it were a Honda mower instead of a TAC. So, we all seem to be pretty much on the same page.
Personally I never sell outdoor machines, and I keep dismantling the same ones to change components, just for fun. There is no "labour budget" involved, because it is recreation to me. I try pretty hard to buy as few new parts as possible, though.