When I ordered my Bobcat from ATC I asked them to make the interior side panels completely removable, which they did by using the square drive screws in the bottom of the panels where there are normally staples (hard to remove without doing damage).
Changing my custom interior cabinets and modifying the "inside the wall" 12 VDC wiring multiple times, the inside panels are showing a fair amount of wear.
So, I've been thinking of replacing the interior panels with panels of unmounted (or unglued to anything) Formica or similar other brands (WilsonArt). I initially thought I'd need 4 - 4'x8' sheets, however, when I went to Home Depot to look over the zillion surface patterns I found out that other sizes are available than 4'x8' sheets. It appears that I should be able to get four Formica or WilsonArt sheets just a little larger than the current interior panels for around $175 total.
The only issue is being careful when making the holes for the square drive screws, as the Formica or WilsonArt material is a bit brittle and would crack or splinter very easily. Hate to ruin a complete sheet of the stuff by not being careful when drilling the holes.
I believe that the Formica or WilsonArt material is about the same weight as the original interior panels. The Formica or WilsonArt material is about 1/16" thick (thinner than the original interior panels). I would lose some of the insulation properties of the original interior panels, but, I'm OK with that.
And, as I said, there are a zillion pattern choices.
I'm thinking of going with a "light" color pattern to help bounce more light around the interior.