This is a well-thought-out transformer build. I’m looking forward to seeing what it goes for. With only 10,500 miles, it’s darn near new. And in Portland, too! Do I know this owner?
As to the L-track/Unwin seat lockers, I’m installing this system for my Siennas next week. Assuming they followed the guidelines for proper installation, this is the same setup used for commercial seat vans and wheelchair-accessible vans. The Unwins allow you to roll the seats forward and back and pop them out for removal. I’ll be writing it up on my build thread when I’m done.