I assume people have seen this?
https://github.com/ryomuk/TangNanoDCJ11MEM/tree/main
It's capable of running Unix v1 & some limited amount of v6 among other
things. The FPGA in question the Tang Nano 20k is sub 30GBP delivered from
AliExpress.
Kind of neat to combine a real processor with a simple FPGA implementation
of the hardware.