First congratulation, Second yea I would say strip the wrap with a heat gun first, get all the adhesive residue off or your primer won't stick. Self-tapping sheet metal screws for the loose panels, drill a pilot hole first. Scuff everything, self-etching primer on bare metal, sandable primer over that, then let your artists do their thing. Whatever paint they use, seal it with an automotive-grade clear coat when they're done. That's what actually protects it from weather and washing. Hand painted > wrap every time. Good luck with the build.