He make the perfect choice to add a 68040 CPU for the Amiga 3000/4000 range of computers.
I can see a molex power supply connector perpendicular to the board.
There is a high risk to damage the board buy unplugging it.
If possible (Imax), it's better to use a floppy connector or to find a way to put it horizontal on a edge.
Else, if I understand weel, the FPGA will provide 2D GFx. So, he can support RTG (Picasso96 like, as UAE do)
But... What about the sound ?
A new AHI driver for Paula, using the PPC power for mixing channels ?