For the purpose of having the most efficient power system you are likely right about separate HBP and Hot end supply boards. For the purpose of having a low cost solution I think you save enough by integrating it on board to justify the all-in-one board.
I have board layout and schematics as JPG files on the wiki on the Use Sanguish page, but I can send you PDF if that's more convenient.
[reprap.org]
I have board layout and schematics as JPG files on the wiki on the Use Sanguish page, but I can send you PDF if that's more convenient.
[reprap.org]