Having done some industrial D.C. Drives before.....getting bits is "sorta easy", controlling it (back feed from a windmilling prop) can be another.
Then add in low volumne for our use, whole new rats nest.
Even a "done deal" can be an issue as UncklHank has found on the -24E project. In his case, European time difference, lack of English as a prime language, shipping time back and forth, etc., etc.,.......figure it out.
Electrifying a US sailplane from gas is a project....period.....