I’m liking how you’ve widened the frame to support the axle. See a lot of these with 6in between the outer bearing and the wheel, it’s got to be more stable and stronger the way you’ve done it. Building my own at the moment and think I’ll do something similar.
You are making good progress on your Auto Union project, I can see it will take skill and patience to package all the components between the driver and rear axle.
You called the rear center section a diff. Are you actually using a differential or is that a live axle. Just curious, I've been racing small engines for a long time and love a good tight differential