back to the back up camera idea. I set mine up to be on all the time. it has 2 video feeds. with a quick switch i can see the passenger side blind spot also. cost less than the 150 budget.
If a real set of doors with OEM style windows are between 125 and 200 dollars and are a bolt fit with a Rattle Can paint finish then the whole project can be accomplished . The only real question is how many hours of mental angst can a few hundred dollars avoid. The OEM doors will provide the best outcome from a vision stand point!