The bed of the aircraft consisted of parallel I-beams as the primary load-carrying structure, with metal sheeting on the top to provide a smooth walking surface.

Like most cargo aircraft, rollers could be raised through small holes cut in the bed to allow palletted loads to be rolled on and off without requiring a forklift.

For the Flatbed this would not be appropriate because the loads would be carried on top of the aircraft, not hung under it, so Lockheed moved the wing to the low-mounted position similar to most airliners.

The aircraft has a number of design features in common with the Lockheed L-1011, most obviously the crew cabin and cockpit area, and the overall size and layout.

The patent application shows it carrying two tanks (looking more like M4 Shermans than anything modern), and they also released concept artwork displaying various truck-like palletted loads mounted in a similar fashion.

In these cases a small aerodynamic fairing was placed behind the cockpit area, which is flat at the rear, turning it into a sort of "pod".