Beneath the skin, a tube frame replaces the production Chevy's welded steel-ladder chassis.
Inside, trim was constructed of carbon fiber and the seats were constructed from tube frame.
The main exception is the central fuselage section, which has a riveted tube frame.
Innocenti, faced by design problems and production issues surrounding his tube frame, produced the Lambretta from 1947.
The cars are built like miniature stock cars, with a tube frame and sheet metal cage.
Custom-made seats with segmented cushions in between outer tube frames were mounted flat on the floor.
The 18A is a metal semi-monocoque construction with a tube frame supporting the transmission and engine.
The result was a central tube frame and four wheels - in contrast to the original three-wheeled Brütsch.
The sleds were steered by a small wheel at the top of a vertical tube frame.
