The sheets come in 5' widths, and no individual panel on the VX is wider than 5' so we only need to concern ourselves with the length of the of the roll. Here are the dimensions I measured for Igor:
L&R front fenders area: 4'x 2' (x2) [4' length]
hood area: 5'x 5' [5' length]
roof area: 4'x 6' [6' length]
L&R doors area: 4'x 4' (x2) [8' length]
L&R rear fenders area: 5'x 4' (x2) [8' length]
hatch area: 5'x 2' [2' length]
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total size needed: 5'x 33' length
These dimensions are rounded up to the nearest foot and roughly an inch below the plastic cladding. I'm purchasing a 5' x 45' roll to have extra just in case.