this would reduce the BOM for the VRM from ~ 250USD to about 140USD
Are you saying that KNC likes to pay more? Edit, ok, it's because KNC likes to over engineer it.
The gerber files from HashFast Evo boards are free from months and yet by this point only peppermining manage the make a working board for the GoldenNonce 700Gh Chip.
I've never found them publicly. One doesn't really need to be a genius to take the blueprints from HF and make their boards. They are only expensive, but still almost competitive.
I'm also sure that HF would be happy to sell everyone chips at $0.2/GH.