Time to start a new thread on this. Let me start by saying paint is lighter than you think, I recently stripped a skyfox of all fabric, wings, fuselage, tail etc, rolled all fabric together and weighed, I was very surprised to find it weighed only 6.5 kg paint, fabric and all coatings associated with fabric.
As for putting vinyl wrap over an unpainted aluminium surface you would be asking for trouble, what reaction with adhesive will take place?