John,
The skirts above and below the (temporary) fiberglass-wound tank on your vehicle appear to be carbon fiber, generally much stiffer than fiberglass. When you proof-test the tank, watch out for damage to the glue bond between them. This was a problem with the Roton ATV 'glass tanks where bonded to carbon. The 'glass tank will swell a not-insignificant amount under pressure, and the carbon won't want to stretch accordingly. The adhesive between them will be under a great deal of shear stress. You might even split a skirt end.
All the composites are fiberglass on the 2' vehicle, but I'll keep that data point in mind for the future.
John Carmack
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