So what I've been trying to do is to have my RC fuselage to have a thin/hollow inside the fuselage feature so that I can start working on the other interior design part of the fuselage and also to save some weight issue. I managed to get the loft with thin/hollow feature in the design but when I tried to close the front and back of the hole with filled surface, I couldn't get it to completely cover the surface due to the thin feature extra padding going outward. I do wish I could do the thin feature to the inside of the fuselage instead of adding the extra to the outer shell. Not sure whether that' possible and I'm not sure whether my explanation make any sense. May I request an advise on how I should attack this design challenges? Many thanks in advance for all of your help.