build your own cores program them into an FPGA

this is really cool if you have some advanced digital design skills:

https://opencores.org/

i was a designer at intel, its still an interest of mine.

ill be checking this site out over the weekend and reporting back but it would be very cool to build your own custom system on a chip. programming an FPGA with it wold be doable, the big problem would be cutting silicon.,,