MOAR UPDATES!
Swapped out the rear springs on the XIDAs. They came with 6"/500lb, I replaced with 5"/500lb to give me more clearance between the collar and the axle.
Keep in mind, the V8R axles are larger in diameter than a stock Miata axle. You'll also notice how far back I yanked the axle boot so it wouldn't contact anything.
Before (about an 1/8" clearance):
After (a smidge over 1/2" clearance):
I'm not running any preload, just threaded the collars up till it kept the spring in place.
I forgot to put the driver side brake bracket on but by the time I made it to the passenger side I remembered...
Before and after of passenger side (this is to relocate the junction block to driver side and make a receptacle for the brake line on the passenger side):
Also mounted up the ECU, TAC box for the drive by wire pedal, fuse box, and the brake proportioning valve:
Bracket:
Mounted (out of the way but easier to get to than under the hood):
The brake lines going to/from the prop valve will mostly be hidden. That's next..
ECU bracket:
Mounted:
I used an OEM S10 mount for the ECU, and just bolted it to the homemade bracket so it wasn't rattling around. I still need to add rubber isolators, just in case.
New parts arrived, thanks to Miataroadster and Treasurecoastmiata: