Van interior paint/coating
 

So i'm cleaning out my cargo van to use for camping and trying to figure out what to do on the floor. Primer and then plywood and then some type of flooring? Maybe a bed liner type paint(smells?). Trying to figure out a way to get this floored and maybe walled for camping. Got a line on some seats for passengers too. New seats seem to be sooo expensive. Since this van is stripped is there anything I should do before walls or floor are put down (sound barrier)?
This is in an '88 E250.

Something you might want to keep in mind.
An E250 (3/4 ton) is one step over a car (E150) and you can't really put too much weight on the ole bus. If you can, you might consider going with light weight additions so you can safely haul all your camping gear. The ideal thing is to have a hi top installed and that really makes a difference where you can practically stand up in the van. I know it's an 88 so that might be out of the question. You could always check with a RV place and see what they use.