Oh come on, who doesn't like lime-green shag?
Interesting to see your rig (congrats, by the way, and welcome!). In my era Chinook, the rounded cover over the door is covered in marine hull liner, the kitchen walls are a vinyl type of wallpaper (that comes attached to plywood already specifically for RV's), and the living room walls plus the pillars on either side of the cab, plus the front of the overcab (the overcab is sort of a storage/entertainment center not a bunk) are covered in headliner material (sort of a knit with foam on the back). The floor of the overcab is the same hull liner carpet (as are other things too). So the vinyl walls in the kitchen were not "done" by Chinook, but all the other things were. All of the Chinook done stuff is attached to the backing with spray contact cement. The door cover is thin plywood, the walls are 1/8" luaun, the overcab floor is something flat (likely ply) and the pillars and overcab front are molded fiberglass.
And let me tell you, after looking at "dusky blue" walls for two years, lime green shag almost sounds good!
Did I mention I hate dusky blue? And it was EVERYWHERE. So some/most/all of it had to go. To that end, I started with the pillars and overcab front piece, and stripped off the old headliner material, then solvent washed them until they were smooth bare (lightly) gelcoated fiberglass. Ahhhh. Then I considered my options, and decided to go back with headliner material. I wanted something a bit "better," but after trying a sample of the more premium "suede" headliner, I don't think I'd be able to get anything else to make the compound curves on the pillars. But the suede stuff is nice (not real suede) if you don't have the crazy curves.
I got some HHR (high heat resistant) spray adhesive (works like contact cement), and then bought headliner fabric from Perfect Fit (online). But there are lots of places that sell it. I also got some additional hull liner carpet in a light grey because in my rig the closet walls were dark blue carpet, and it was like the black hole of Calcutta in there! I'll re-do that in the light grey hull liner and actually be able to see inside the closet (imagine).
I started with the pillars last week, and let's just say there is learning curve. Literally, as making the fabric take the compound curves on those pillars is a bear (and of course you only get one try with contact cement). After the third try I think I have it figured out, but by that time I ran low on fabric (and the dye lots are apparently inconsistent enough that you don't want to mix and (not) match. So, "order more fabric" is on my list.
Just so you can see, here are the materials I'm talking about:
This is the "hull liner" that is somewhat similar to what is on my Chinook's ceiling, on the over-the-entry door piece, and also inside the upper cabinets. It's not an exact match, but is similar. It's what I'm going to put in the closet. One note is that the one that is more "dimpled" looking is more similar in texture to what Chinook used, but just because, I ordered some of the smooth stuff too. The smooth "sheds," whereas the dimpled looking one does not.
http://www.perfectfit.com/15593/154092/ ... er-72.html
Here is the headliner material:
http://www.perfectfit.com/15994/154077/ ... ng-60.html
And the adhesive:
http://www.perfectfit.com/24783/148343/ ... Grade.html
or
http://www.perfectfit.com/24783/154451/ ... esive.html
This is the solvent I found worked the best for removing the old (and then the new

) adhesive:
http://www.perfectfit.com/24783/155892/ ... eaner.html
I still haven't decided what to do on the living room walls. They have the headliner material now, but I'm not that into upholstered walls

So I've been considering other options. One contender is "wall liner," which is essentially a thick wallpaper that is meant to be painted. It comes in either plain or textures. Just painting the luaun wouldn't be very satisfactory, as it's very open-grained.
PS: A couple of things I really like on your era Chinook are that little pantry cabinet next to the sink (vs. the "in your face" one in my era rig), and the simple/clean overlay doors on the upper cabinets. Really nice!