Yay, I can add pics!
Before I decided to aerodynamicize it, I was "building" it in Sketchup in a normal cap shape. I'm building drawers between the side walls and the bed walls, a slide-out workbench and drawer in the bed bottom covered by a slide-out cargo tray, side toolboxes on top of the bed rails, and a 210-watt residential panel on the lid to charge four golf cart batteries. I have the panel, charge controller, and a 2000-watt inverter already. I still need the batteries, battery monitor and wiring, fuses, switches etc.:
After I decided to make it slippery, I used the template. I couldn't build the lid curved like that and still keep the solar panel flush though, so I designed the lid to be flat, at an angle of 11 degrees:
The side walls and front bulkhead are 3/4" exterior ply. The walls are as far apart as the wheel wells, I wanted to make sure I could still fit 4x8 sheets, or anything else you'd need a truck for, like lawnmowers or a bike, inside. Here's my start, with some white kilz primer:
