Body Finish and Composition
The exterior body panels are of brushed stainless steel SS304.
This steel is usually referred to as "dairy grade" because
the tanks and piping used in dairy farming (and in restaurant
countertops, etc) are of this grade. It can be considered "food
grade" stainless. This grade of steel is softer than SS316
which is more brittle and is usually used in more industrial applications
(and in knives I believe).
The stainless panels have no "clearcoat" or other finish
and is merely brushed.
The underbody consists of a monocoque fiberglass tub on which
the stainless panels are hung supported by an epoxy dipped soft
steel frame with a design borrowed directly from the Lotus Elan.
[Owners Manual]