Hi Zebedee, I tried to follow the keep her light philosophy and opted for 12/9/6 ply and some 20 x 40mm softwood frames, worktops finished with Formica. Working with plenty of cardboard templates and time and finished in same primer and gloss as the exterior. Not too expensive but I say again you need time to get all the curvy bits right. Some phots finished and in build.
I’ll get on it. Techniques are totally applicable to camper interior building. I haven’t built my own as I’m deep into an engine build and renewing mechanicals.