I just looked up L39 because I too, am a Jet Pilot. (RC planes, but still...principles are similiar).I'm the nerd side of stuff. Got into ChampCars to build the motors and learn how to set up an aero car. Competent as a driver but no star.
Same on the L-39 side. Got into them to build Garrett engine versions.
Currently trying to make the bigger version of the motors breath in the airframe-
Fly them to fly off the Phase 1 flight testing then on to their long term owners.
On the Plaid side, it looks like Tesla has addressed all the suspension related issues. Camber is much better as delivered and there does not seem to be that much camber gain when lowering. In addition, the way they have done their upper a-arms in the rear makes it super easy to shim out camber if needed. No more having to make new arms . The did a really nice job on the refresh. I have no idea what the underside of the Lucid looks like but the refresh is a pretty high bar.
Used L39's can be had for around $250k. I can afford that (with a under 2% loan..haha).
(I can only imagine the expense of maintenance and actual flying costs)