My first RV & maybe my last! This was very complicated & took way longer than anticipated. Thank you CC'er for your tips. It is covered in buttercream (high humidity) thank you Indydeb! Fondant accents & lots of dowel support. Used 3, 11x15 sheets stacked. Didn't turn out exactly like i had hoped, but I'm not an engineer yet! Thanks for looking, appreciate your constructive criticism.