Such a cool car to resurrect
What is the original color? All white? There may be original paint hiding under that tan color. The pictures are not good enough to determine what to do with the paint and engine compartment pics are needed as well
A creative painter can knock that coat of paint off to see whats there without ruining what is underneath it and if lucky can bring up some shine. They would also be able match the door to the rest of the car. Some one with a little artist in their paint skills. The car can be paint matched and massaged including taking care of the holes to meet the requirements - you just need the right person. There are several ways to improve the paint without doing a rotisserie restoration so the car can be driven and enjoyed sooner.
Flat clear coat applied lightly will preserve the patina if you go that route and not look like it has clear on it. Nothing worse that seeing clear coat on a paint fatigued car as it immediately makes one wonder if it's real patina. Many times it is not.
A good graphics artist could print a decal to match the drivers door
Restore the interior and engine compartment if needed
As far as the ground straps- they are oem cop car.
Cops cars have extra grounds, extra welds and bracing.
Check the deck lid & hood for evidence of a ground strap - a fully grounded car makes a better
ground plane for antennas.
In todays times a preserved parked next to full resurrected - the preserved car will get the most attention