This is not going to be cheap. That was never the goal. In low volume when you combine several custom multilayer boards, custom powder-coated sheet metal work,

This is not going to be cheap. That was never the goal. In low volume when you combine several custom multilayer boards, custom powder-coated sheet metal work, etc even if you allow for the practically-free recycled FPGA this is going to probably end up being a $5-10K project. The last custom one-off 1U I did from ProtoCase was like $800ish just for the enclosure, and that was before the recent tariff hikes.