I bought a set of those dollies made for moving cars around on their wheels. The frame balances perfectly on it and is really easy to move around! Obviously to remove the wheel carriers I'll need to support it elsewhere, but right now I'm focusing on cleaning up the rust situation on the underside of the car. Most of it is just surfaces stuff which I'm sanding off and will POR15 over. But one of the front posts is really, really bad. Or at least the area under it. I'm going to clean it up with my dremel and probably fill in the holes with POR Putty then paint it. The part underneath it, I'm going to try to have a body guy look at when I get everything back together. It's actually part of the rocker, which I think I'll have professionally replaced as a big Christmas gift to myself. Other than that, though, looks pretty good. The bright side of having diff oil flung all over is that most of the undercarraige is rustproofed.
Here is a close pic of the axle. It appears the "lump" is part of the axle's end, where the boot attaches ... it turns fine, nothing loose or clunky. Odd.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)