One way to upgrade the gen 1 interior is to do the 89-94 dash swap. I have been toying with the idea of doing this.
As far as having tilt steering, wish that my truck had it but doing the dash swap requires the getting of the steering column which more or less has tilt.
As far as the floor, I put underbodt spary on mine and it wore off where my feet make contact so I have to redo that. I didnt replace all of my floor borads (well I did) but all i did was cut out the bad stuff and then took good floor boards out of another ranger that I cut out and just welded it on the older ones but made sure that what it was all welded to was good metal.