Rear uprights coming along well.
There are a few options for hubs including 5x120, 5x4.75, and 5x114.3. All accept large 33 spline outer CVs and there are a few different axle solutions that range from an outer CV swap to 930-style CV conversions, depending on your torque requirements.
I'm using the 5x120 hubs to match my front uprights (C8 bearings). BMWs use this bolt pattern and E90 3-series offsets are pretty much spot on. There are plenty of options for track wheels for these cars, in sizes up to 18x12 or larger as well as more tame fitments like 17x7 and 17x8.
The upright is fabricated from laser cut and bent steel components which will be welded together. I designed it to be modular with a face plate accommodating the brake and hub package, and a back structure determining the suspension geometry. Obviously once it is welded together you can't change anything, but the design makes it easier to support customizations without a compete redo.
The test fit of all the components went well. Hoping to have some time to weld the first one up in a few weeks and get it on the car.
Suspension geometry structure:
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Hub and brake carrier plate added:
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Brake and hub package test fit:
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Roughly how it will look when complete, just missing the rotor and parking brake bits:
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