I've bought a GK850 and a used K95 Vengeance for 200 and 250 PLN respectively, I'm thinking about selling both of them off and building my own keyboard now that I got some experience. Are there any companies that offer PCBs similar to the K95 Vengeance layout but with better positioned and profiled media controls above the numpad and something resembling those 18 extra programmable macro keys on the same circuit board as opposed to a seprate daughterboard?

If not, then I'll probably just get a separate alphanumeric pad of some kind on a separate USB connection anyway. Having the entire keyboard be programmable on a hardware level with more modifier keys and macros are more important to me so I don't have to use proprietary Windows-only software.

Oh yeah, and if they support those magnetic hall effect switches then all the better.