Regarding the vinyl 1 piece door panels and the vinyl/ cloth or vinyl/vinyl two piece door panels, Ford changed all the door panels in 92 to a one piece design that I'm sure was easier (cheaper) to make. I found mine from a 92 4 cyl with black interior. All the 87-91 door panels have a separate part that clips onto the main panel and it is covered in whatever material the seats are upholstered in, be it tweed cloth, LX cloth or vinyl. I've seen them all 3 ways.
Here's a pic of my interior:
http://statefilingsoftware.com/pictures/front_w_halos.jpg
And my door panel. I added the carpet to the bottom to replace the map pockets:
As far as the newer rear seats in a vert, I know the fronts work fine, but the back ones will require some work. I know the SN95 coupe rears are the same width as the Fox hatch seats and fit just fine, I have them in my LX. I think the newer SN95 vert rears are narrower also, like the Fox vert rears, so they might work with minimal mods. It would require some measurements to make sure. If you want to measure your vert back seats, measure the seat back across the top and the height of the seat back, along with the seat bottom width at the front and back. Then I can compare them to the SN95 coupe seats and some SN95 vert seats. You can make any of them fit, it just depends on the amount of work necessary.
Oh, also, I put the 90 model rear belts in my 87 with the 90 model rear quarter panels. I really wanted them for the potential safety benefit to my older children in the back seat. I mounted the belt retractor to the wheel well with a seat belt bolt and several large washers. I'm sure it is not as strong as the mount Ford has for the 90-93 cars, but it is better than just the lap belt alone IMO.