Painting the trunks/engine bay/underside/cabin, POR-15 and leave black? Options

[boxsterfan]

I have been thinking about what I will do with my car in the future when it comes time to restore. On many cars, I see people have appeared to POR-15 (or other) the trunks/engine bay/underside/cabin and then left it black? They then go on to paint the rest of the car as normal (orange, red, white, green, etc...)

I'm not looking to build a concourse winner myself. I am looking to build a car that is restored and protected from rust for as long as possible (another 40 years lets say).

What do people think of POR-15'ing (or any other product) the trunks/engine bay/underside/cabin and then leaving those areas as that? And then (in my case blue) painting the rest of the car as normal?

[MMW]

A 914 should have the trunks painted body color. I don't like the look of different color trunks than the body. Black trunks look like a bottomless pit. If you are going to paint it anyway then why not paint it body color? Unless you like the look of black then o/k, it's your car make it how you want it.

Just my opinion.

As far as por goes I welded in cage for my buddy & he used por15 on it. I think it looks horrible. He spent a ton of time prepping as per instructions but it has many deformities in the finish.