This isn't necessarily something I'm looking for but it occurred to me looking at photos of the prototype with the passenger doors open that they too largely face the sky and sun when open. More PV cells could be added to the doors, perhaps enough to bump the total wattage to 1000?
Of course they would only make a significant contribution when left open, so really only workable in a secure location; like maybe when you are camping and have the back hatch open also.
I imagine them being a cosmetic detractor. Think I prefer the current smooth egg shell look now. Still some folks might want to push that envelope and 1000 watts would be another catchy sales point.