I used 1/8" Baltic Birch as the new walls, and ripped that to 1" wide for the ceiling strips. For the plastic bits, take old ones with you to Home Depot and get new stuff.
Hmm thanks for the info I was hoping to find the same stuff as the camper as I only need to replace one wall and a few of the roof sticksMenards has some 1/8" faced plywood from american pacific. I am likely going to use the bambu version, I have a sample of it. Problem is its an order item to Cheyenne and like a month out, not sure your timeline. They have some other versions that they stock in store though if they appeal. I couldn't find anything local I liked the look of. They also have plastic J trim there in white and grey 8' lengths and some other color in 4' lengths in the ceiling tiles section.
Hmm thanks for the info I was hoping to find the same stuff as the camper as I only need to replace one wall and a few of the roof sticks