Amaranth is my main homebrew project at the moment. After mostly finishing up with the Motorola 68030, I decided PowerPC was the next architecture i would target. It uses a PPC603e PowerPC CPU running @90MHz, and features my FPGA VGA controller, Diapason. Of course, this is still in the planning phases. I have currently put Amaranth on hold until I get Diapason verified on hardware. In the meantime, I am busy researching the PPC6xx bus interface and prototyping the verilog for the central PLD.
As of publishing this, I already have just over 2 months worth of research and design invested in this project.