This is my train of thought for the floor: after I spray more ospho and rustoleum on the inside and about 2" around, I was going to apply something similar to epoxy to coat the whole floor, plug the holes from the seats, level and give more thickness to the sheet metal as it is a bit thin in some spots from rust. Looks like a material like the epoxy for garage coating is too thin, and it would run through the holes. But then I thought "what if I stick some type of a mesh on the floor first, then apply the epoxy?"
The idea here is to keep the overall thickness of the floor to a minimum, as I want to add soundproofing layer and self-sticky tiles for finish.
So final floor inside would be: metal, rust treatment coating, epoxy or this > http://m.homedepot.com/p/BEHR-Premiu...801/204166284/
layered enough to plug holes from seats and other screws, then sound and vibration reducer > http://m.homedepot.com/p/4-ft-x-8-ft...6BX/100663624/
, then regular sticky tiles.
What do you all think? Be gentle....
Disclaimer: i posted h-d links only because it's 5 minutes away from the house, not intended as publicity or soliciting in any way. I've also gone to Lowes and ace hw many times
And BTW posting from phone, so let me know if the URLs get messed up in the interwebz