I know it's past midnight but I just came in from the shop after a full day of working on the DriftBeam! It may not look like a a ton of progress but I wrapped up a lot of little things and have the PS S2000 rail section in it's final position and partially welded in. Before doing that I had a bunch of welding to do on that piece to fill holes and improve rigidity.
This was the only rust-thru spot I've found anywhere on the car. I opened it up back to good metal and sprayed the cavity with Rust Reformer:
Welded up:
Like it never happened:
Firewall "before" (some holes already closed in this pic):
Same area now:
Driver's side with only the essential holes remaining:
Full effect: