Well, I have to hand it to you for taking this on...
The white '92 doesn't look that great either. As you know, it has been lightly rear-ended. Enough to push the bumper into the body below the tailgate, and bend the carrier mounting. I imagine that would be costly/difficult to fix. It appears the right front fender is out of alignment, so it may have taken a hit there too. Not sure, but the drivers door may be sagging badly. The only picture of the '91 that I could find actually looks better than the '92. The '92 has been repainted, and that could be hiding a lot of sins and rust.
Our PF is white with red interior. At first I didn't like the red, but I think it's ok now. They do take on a sickly orange color if they fade, though. Ours is basically like new, so it's a nice dark red.
Here's ours:
http://www.buysell.com/root/detail/B..._V6_4x4_5.aspx
It's a lot of work to switch all that stuff. But not as much as fixing deep and extensive rust. For instance, to fix a rusted floor you have to remove much of the interior anyway. You'd get to "practice" while removing the parts from both vehicles. Again, the frame is the key component. A basic question is whether you are more comfortable doing rust repair, or component swapping.
I know swapping the gas lines is a hassle - if you try to do it without splicing them. A dealership had trouble replacing mine, but they installed the new ones without cutting them. Brake systems are designed to be workable. The dashboard might be a bugger. The console is easy. Door panels not bad. Seats/belts are easy enough. The worst might be the plastic door frames etc. Do you have to deal with an airbag in the '92? Do you know if all the systems like power windows etc. work?
If you have the time, place and mechanical ability to do this, it will be worth it. If you have to pay someone to do it, it's not viable. Like rebuilding a collector car, it will have to be regarded as a hobby.