I will eventually be changing out the flimsy fake wood panels, just not yet. The only panel getting changed is where the fridge (once I find one!)will go so I can put a flat screen TV on it. After a lot of back and forth on how my finished interior will look, I've decided to keep the darker wood as I think it looks better with my wall color. Plus once I get the rest of my window surrounds back from the chrome shop, all the accents should make it pop. The floor color came out better than I hoped and made me see that I liked the darker color, just not the drab, dull fake wood color that I started with.
As for the wall tiles, make sure your utility knife has a sharp blade and I found pliers helped a lot snapping the pieces. Especially the smaller one. You are cutting through a thin top piece and a thicker bottom piece that you don't see at first. Only stabbed myself once and that was cutting open a package! What's a job in the Airstream if you don't bleed a little?