I've removed about 60Lbs or so of the stuff from my car's entire underbelly including the rear end well and all four wheel housings.
Never thought it could be that much!
I would like to get rid of the undercoating on my car, I really dislike working on stuff under there especially where it's dirty/grimy. If I ever restore the body, it's all coming off.
Some weight was actually added back into my car this week when the back seat went in. That was not a fun job with the roll bar, it 'kinda' fits but just barely. I only put it back in for my kids. Kinda rather just have a divider panel but it's done and it ain't coming out. My oldest was in the seat and after about 5 seconds he asked if he could get out. If I do take it out, it's getting cut in half and tossed.
Have not started on my 'glass hood yet. Baby steps.