I received a quote from a body shop of $7,000 to repair a 3' square dent/hole in the side of my fiver. It appears that that body work everywhere has vastly escalated in price. The area was at the point where the aluminum skirt meets the upper fiberglass. So, I repaired the hole in the fiberglass with Bondo brand body filler (thick type epoxy resin/hardener for vertical application). Cut up fiberglass cloth making small pieces; and mixed in to increase strength. Both came from Walmart. Apply in thin layers, allowing to dry in between. Sand and paint. Agree with applying sticker over top if you can't match the color.
Purchased the aluminum skirting, door, and stripping from the fiver manufacturer, and replaced damaged parts. Cost of total repair was less than $500, which also included body work sander, and paint. Found a auto paint store that matched the fiver color with a scanner (took small door there to be scanned). White color match was not perfect but close enough. Passed my wife's inspection. :-)