Only factors are weight, really. Rubber and aluminum suck. Fiberglass rules. And I paint the ***** myself, so swapping out is easy--I guess. Although, the painting isn't as much fun as it could be.
The door panels were made for 28 bucks. They're light. They're not snapped on. The panel can't handle the tugging. So I used long strips of velcro--I don't like toiling. If something's wrong, I need to get that panel off. The velcro holds them well (very wide)...and you just pull them off.
Yes, I took off the door handles, got new rubber gaskets for them, took out the locks, and painted them red. If they can do it on 993s, I can do it. They look quite cool in person or I'd have changed them back.
The weight continues to go down. The ducktail is light as a feather, and so are the side panels. But I'm running out of things to swap out. I haven't weighed it.

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Panel opens door and passenger can close it. Again, bare minimum. I don't care about making it fancy, just functional.
In the end, I don't care about making it Ruf or anything else. I'm just looking for the combos that work. Not striving for any particular look or model.
In the end, it's a blast one way or another.