I got the mock up axles taken apart so that I can send them in for fabrication. The Audi tripod end came off with a little persuasion and help from videos on YouTube, but then at first I couldn’t get the outboard GM CV off. Then I found a hidden circlip and they came right off. I bought two more re-manufactured GM axles after the first pair were junk and the CVs were shot. I used the axles with the blown CVs for the mock up axles. The second pair were re-manufactured by a reputable company and not just an eBay ‘reman’ special. I carefully took the outboard CVs off those axles and will use them on the custom axles. I’m using the stock Audi inboard tripod CV joints on the custom axles since they are still in good condition. I measured the distance from the wheel bearings to the transmission flanges and the right side is 1.25” longer because the transmission diff is slightly offset inside the transaxle case. I compared that to the disassembled mock up axles and one axle is exactly 1.25” longer than the other. That means that the position of the sliding tripod joint inside the inner CV housing will be the same on each side.

I’m still deciding on a location for the fuel injection ECU. Logistically it would be better to mount the ECU on the engine side of the rear firewall and then the wiring would be much shorter. The ECU housing is designed for a harsh environment, but I keep going back to where OEMs locate the ECUs and think maybe inside the car is better. If I can locate a metal box to shield and provide protection for the ECU, I’ll mount it on the rear firewall near the engine. A metal box would provide protection from knocks and flying debris and the plastic cased ECU is sealed against water and dust.