You just figure it out like everyone else does. Ask questions on the forum and everyone will chime in (even people like I that have nothing to offer). ;)
If all else fails then you can always ask Fran..
I’m sorry but there’s nothing fun in re-designing and fixing every fucking thing on these cars. Some people value their time and Fran definitely isn’t looking out for his customers. He could do quite a bit to save the builders a lot of headache but he could give a fuck.