Hello @sab35263 -- welcome to the site. Hopefully someone will be able to give you some feedback as I have no info on the LX 600... but the 700 issues have been very minimal.
If you need garage tiles now is the time to do it. Been researching it for a while, cheapest I could find was at Home Depot for around $2.92/sq. ft. Fast Life is running a promotion right now, BOGO... I ended up ordering 1600 sq. ft. for my new house... if you use my link we get some affiliate...
Don't want to rain on parade and I'm sure your kit will be more complete but our own member @Eric Sorensen did a nice write up here: https://www.lexuslxforum.com/threads/lx700h-3rd-row-seat-removal-step-by-step.98/
I don't blame you on the wait... the markups on the GX550 are just bonkers still. It amazes me since it's been out for so long. Welcome to the forum @pnw_guy
Crazy, everyone is probably afraid of all the shops that got busted for diesel delete stuff. I'm sure you'll find someone, they just may want to do it off the books.