Wow, this is so awesome! You learn real skills, starting at the transistor level. Add the coding and run real applications: chess, doom, minecraft clones, java, etc. GIthub repos
TINY-32 is a full 32-bit RISC-V computer made of 93,338 transistors. It passes the official RISC-V test suite and runs real DOOM at full speed. Fully open source.