FYI: https://www.eejournal.com/article/ibm-gives-away-powerpc-goe...
You could, in theory, run code generated by your own compiler on a PPC chip you designed and built with your own hands and brain.
Random thought: would it be feasible to implement PPC on an FPGA, as has been done with RISC V?
Anyone know offhand what’s the most powerful PPC system you can readily buy? I’m guessing it’s one of the PPC Mac machines.
Do you specifically mean PowerPC and not the POWER ISA?
If not, there's at least https://github.com/antonblanchard/microwatt
And the most powerful POWER system you can buy would be something based on the POWER9 processor.