I rolled a FFF tube with my bendfoam tool but it wasn't true round but I'm going to try tapeing a piece to a round something and rolling. Heat gun does wonders. Slick way to build is a block for the nose and a cylinder behind. I have seen cones rolled for the rear of fuselage. Like around a coke bottle. Cylinders are great as you can move your innerds where you need them Theres a SE5a 32" bipe in RCGroups that I want to build. He used a block up front and FFF behind. Undercambered wings & skewers for braces.

Ken