The control board and the hash board require separate voltages. In my opinion the best bet would be to spend the $300 to get an actual PSU thats meant to work with the miner. This then means that the only component thats not factory is the hash boards (and the fans). The hash boards simply have some SMD diodes for reverse current protection and some capacitors along with the BM1398BB chips.
I'm pretty sure the hash board will draw a lot more current than the control board, right?
Somehow it's hard to find digital PSUs on Amazon that can output 150A and not some low amount like 5A or 10A, which makes me wonder whether high-power drawing PSUs are are only readily available from generic sellers on Alibaba (considering most of the PSUs end up in China anyway)?
Alibaba does have services where you can send in a pcb and they'll clone it for you for cheap (again, pcb = just the board no components on it). But i sadly dont have a board i can sacrifice, hell there isnt even a proper image of the board on google yet -_-
But then how are you going to mount all the components onto the cloned PCB when you don't have duplicates of them? That's assuming you can somehow find out the model numbers of them all.