Please excuse the different idea post , and also the fact that my ideas are against the flow and my knowledge is limited..
I think open source is a great idea sometimes , but not for a case like mine. I just need MORE POWER than a Gecko 320 can deliver. The Gecko's or there copycats are very highly developed , cheap , and much is known about there behavior. I have been watching the UHU project for a while. The UHU project is going no were (that I want to be).
THERE MUST BE A WAY TO TAKE A INEXPENSIVE GECKO controller , which is just like a commodity at this point , and add a high output power stage. That way we do not have to re-invent the wheel , and can focus on getting more power.
I envision a stand alone card which is connected on the input side to DC power , plus the output wires from a gecko or ANY OTHER SMALL DRIVE. The output side would be higher amperage current and would 'follow' the gecko. Perhaps a 'dummy' load would be needed on at the inputs so the 'gecko' or other drive thinks it is driving a normal load.
Consider how much simpler such a board would be. I guess it would be a lot like the output stage of a UHU.
No doubt a few people will say . Cant be done , impossible , etc., those folks might have believed in a flat earth in another time.
If a dc drive expert would care to discuss how this could be done and perhaps sketch its layout and parts basics, I would be glad to spend my time and money trying to make it work.
Or if someone could explain in simple terms why it is fully impossible , I will accept that.