Hi Guys, I just finnished a 1/4 balsa stick fuse for my 3dx. I used the same wing and tail feathers. No need for a carbon spar in the fuse as a covered stick fuse is stronger than the cf foam one. A little ply for the gearbox mount and voila!! The fuse does not twist half as much, is stronger and weighs practically the same. I also just bought a Thunderpower 2 cel Li-poly 2100 mah battery and can say that I have never seen anything like this plane before. The combination of the GWS 6.6 to one gearbox and this battery are awsome. Yes I know the idea was to keep this model cheap and the battery and the needed charger are not cheap, but WOW!!!! the perfomance is awsome. I flew for 20 mins. on one charge and most of it was hovering and vertical pull outs. The all up weight is 12 oz. Do yourself a favour and pick up one of these batteries.I am waiting for some depron and will be building an Ultimate soon. I will post pics soon and perhaps some video. Thanks once again to the guys at foamyfactory. MAD out.