Actually, the project grew organically. A guy in france asked me if I can build it. I said sure, but it will cost you half as much if I can release the design files and have freedom to build upon it.
Fast forward a few years later and I’m still using the IGBTs he lent me, and the ocassional consulting and orders around it lets me buy the equipment.
GaN just can’t get you in the 300A range, but SiC can, we hope we can give it a try someday… but THAT is real expensive stuff!