For my lights, I bought one interior RV light. However, I didn't feel like it put out enough light so I found some Kayak LEDs at Ollie's and found some light covers for them on Amazon. Overall, I think it turned out pretty well.
Very helpful build you posted! Keep it up. I built and posted a teardrop build here years ago, and am now just starting to think about a foamie canned ham. I didn't know anything about foamies until yesterday! I'm a plywood guy... but it's got me interested! Ken