I really like a LOT of what this car illustrates.
The rear suspension though is pretty heavy duty, and a bit complicated. It can be done simpler and lighter. No I haven't done it, nor will I. I did design it though and purchase most of the materials.
At the end of the day, it still has a ball joint beam. And that beam has coilovers/booster shocks at that. I believe that is where the suspension really needs changing in the Spyder world, the rear could be done easily enough.
I really don't get the 4 x 130 wheels though since so much effort was spent elsewhere. Wide5 or 5 x 130 would be better. Type4, 901(or is it a 915?) trans, Kuzu shroud. Front oil cooler and ducting. Really intricate tube work: almost Birdcage Maserati tubes. Very, very cool stuff.
I bet that thing weighs as much as most Speedsters now. I really like it, don't think I'm dissing it. I would have done some things differently if I was spending all the cash that took to get done.