With regards to film cutting I use either a rotary cutter or get the misses to do it.The results you get from a vinyl cutter make that investment worth considering. Your choice of fuselage x-sections remind me of ridge racer, aeolus, kipper designs; does a round fuselage really make that much difference? The utility of having flat field and slope options in one airframe might make a compromise on performance worth considering. I'm looking at fixing my Demonstrator wing and the gravity fed foam wing cutter you've used on the Lupo/ Rubin( I think I've got that right) is an option I'm considering - it would then have a wider application for a modified Rolo.