Hi Charles! Welcome to the site. This site is a fabricator's dreamsite - practical and exotic all blended nicely. The uprights for the rear are fabricated. A little heavier that needed (9 kg), but nearly bullet proof. The hubs that bolt up to them are some McKenzie's micro-stubs (dune racing parts) using 930 spindles joined up to a GM wheel pattern. I believe the bolt pattern is the old S10 truck pattern on the bearing retainer.
The transaxle in in limbo right know. I'm made all the plans, and aquired all the parts for a 930 transaxle application, but recently came across a reasonably priced 016 that I'd rather use. The only problem is that nobody makes an adapter plate for the LS series motor. So I've got to decide now whether to go LS/930, or SBF/016. The main reason for this conundrum is the shifter rod on the 930 poking out (too far) at the very rear of the transaxle. So even though the 930 is stronger, the logistics of it's fitment are another issue. I weighed the 930 last night and it came in at an even 100 lbs, which was a lot lighter than I expected. I imagine the Toranado transaxle is going to be significantly heavier.
In answering your last question, the axles will be 930 axles. They will provide the plunge needed, and are easy to replace and/or change length.
This weekend I finally did a corner-weighing session with the car sitting on a complete suspension (sitting on the rotors, but with no wheels), and it came out to 222 lbs on each front corner, and 207 lbs on each rear corner. This was with a pretty much complete chassis, but with no gas tanks, body, or drivetrain. So it looks like I am still on target for a 2000-2001 lb net weight.
Any information about the Mirage would be appreaciated.
You're probably wondering why all the 3/4" square bracing on the radiator duct. I plan on using the front of the inlet as a jack-point and felt it needed a lot more support than the sheet box could provide.