What I have learned in my ev conversion using all used electric or hybrid car parts is that taking the hardware and installing it in the new vehicle is not the problem, controlling it is.
You can not just remove the motor, inverter, and controller from a E Golf and bolt it up in a Vanaggain it won't work. If it is anything like a Nissan Leaf (please check out this brilliant Rob Smith
YouTube video 2012 Nissan Leaf Drive System Tabletop Demo
where he tries to get it running outside the car on a table top) it is going to look for stupid stuff like the OEM gauge cluster, a bunch of random relays, fuses, junction boxes, and god knows what else, and if you were to painstakingly transfer all that crap to the new (old) car you might as well just do a frame swap and weld your Vanaggain shell aka body on the E Golf chassis (I'm sure they are unibody so that's mission impossible) see what I am saying.
So the motor will need a VCU Vehicle Control Unit pronounced controller, same for the battery charger, those things need to be controlled outside the E Golf, the original components essentially need to be fooled into thinking they are still inside the original car so that they will work.
I am not trying to rain on your parade, I am just trying to prevent you from going down a rabbit hole, think economies of scale, the brilliant group of folks who are reverse engineering this stuff, are probably going for the biggest bang for their buck, so would they rather reverse engineer the Nissan Leaf components (second most popular electric car ever sold in the world) or an E Golf (not even a blimp on the radar)
OK, enouff ranting let's hear a solution: well if I was doing another conversion I would seriously consider the Toyota Prius plug in hybrid dual motor drivetrain and that Toyota indestructible Inverter / Converter / Charger of theirs. Time to get acquianted with EVBMW.com
and Mr. Damien Maguire Toyota Prius Gen 3 Inverter Hacked