Been working on the rear beam. I decided against using the Syncro diff and went all-in on the Haldex. 2 days of chopping and grinding and welding right here. Still have the camber/toe plates and the rear rubber mount to install. Once I get that done tomorrow I will clean it up and send it off for blasting. I can't decide between powdercoat or galvanizing. I have a friend locally working at an industrial-scale galvanizer and they can dip it for pretty cheap.
I tested the SQS controller and it works great when turning the diff by hand, we'll see what it does in the car. As soon as the rear goes back in the car I then have to remove the 21/20 angle drive and install the Skoda angle drive. I eyeballed it today and it looks like the mounting bracket is different on account of the Skoda unit being so much "fatter". I don't want to take the engine out again so hopefully I can get **** fabricated with it in the car.
More thoughts.. To do list is getting long at this point. Reinstall air bags (and new rear Mk1 bags), re-do the air system and try to fit it all under the original metal rear floor panels, make a new subwoofer box to fit in the same area (fiberglass?), bleed brakes since I had to remove the rear calipers, potentially have to notch the exhaust where it goes over the axle, bust out the fishing string alignment jig, cut and weld rear axles, convert passenger side front and both rear axles to 100mm CV joints to fit the Haldex and Skoda bits. blah blah blah