The frame is done, so the next step is to bridge the spaces with MDF and then fiberglass over it all. The big flat bits on the left are the radio mounts the short diagonal parts near there are the switch panel mounts. The trapezoid thing on the right is for light/soft/small object storage - it's getting MDF on the front, rear, and bottom with a bungee mesh on both sides.

When it's upside down, it kinda looks like a big remote control car or mini rat-rod frame