Armchair nobody here: Not surprised they appeared to have ignored emails (loads of places do this hoping the person just gives up, half the time it works). They're also slammed with orders right now I would imagine (and have been for months).

It's kind of uncharted territory using "home made" parts, with little or no instructions. However it's pretty obvious when they make a truck ton of these and then one happens to be backwards, that it's incorrect.

My main concern is, how many are incorrect.... this could be quite a big issue for others.

Good luck on whatever happens, and that is my uneducated, useless opinion on your unfortunate scenario.