Thank you Dewey, that is very encouraging!
I hope to
Build it with the smallest battery and motor since I live in a flat city and don't have the best brakes on the bike.
I can use a three speed S/A hub with a coaster brake.
Best to you!
The threads are not used when a mid motor is installed so it does not matter that it is 26tpi. The width of the bb is important and they is a range in most emotors.