Scratch build materials

[Espeefan]

For the most part, any readily available RC model kit's major sub-structures are built out of aluminum. It's light and strong. Some of the larger machines, like those from Vario, are steel, with some unique epoxy-like casting over the top, for detail purposes. Shear size and weight seems to really boost the performance, but I think most would agree that the smaller aluminum models run pretty good too.