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The 3M wrap itself can be purchased on eBay cheaply, and wrapping a relatively flat area like the roof isn't nearly as hard as complex curves.... Might give it a try yourself to see if you like the look?
This is what I thought as well. Just give it a shot. If you fail you’ll at least see and decide if you’d like the look and if you do you can pay a local shop to do it properly. If you get it right on your own you’re good to go, and if you don’t like it you can just peel it off. Basically nothing to lose.
For the look, the Porsche car configurator with and without a glass roof will probably do at least as good a job as a photoshop. You can use the 3D function and see more angles.