Here's a good image of the framework that went into the construction of the velomobile project. The framework was made up of individual foam and fiberglass ribs that were then covered with Styrofoam strips like my kayak project. The body was then fiberglassed inside and out for a strong lightweight structure. The process could be used in a composite teardrop the same way to get a nice smooth strong shape for the design. This is my plan for my Radius teardrop design.