The one I'm working on now isn't built for hard-core wheeling. I wanted quite when driving, insulated, and a comfy feeling.
I rebuilt the top by welding in some extra bow's, then new paint inside & out, 1/2" semi-rigid foam insulation, and then 1/4" bubble-wrap insulation, then fitted in a new headliner.
For now I choose not to spray bedliner on the inside foor, because it's still in pretty good shape. After another 10 years go by I'll probably change my mind and blast it and then coat w/ bed liner.
I'm using heavy wool-type of auto carpet insulation for the floor, then a good quality & well fitted carpet. I bought all of the carpet, including the hard-to-find inner wheel well carpet from ACC.
Next, I used the bubble-type of insulation to wrap the inner fender wells. It seems like a lot of noise -not the least of which is rock's getting flung up from the tires and then pinging on the inner fenders that seems to make a lot of noise inside.
After insulating the inner fenders, I installed some pre-fitted, pre molded, carpet over/around the inner fenders. I choose to use hot glue for the adhesive to keep the insulation & carpet in place for the inner fenders...my thought here was that if I don't like it, it'll be fairly easy to remove versus some really good adhesive from a caulking gun. During the process I learned that using a hot glue gun works perfect! It sticks good, not messy to work with, holds securely and sets up fast.
And to finish off I wrapped some auto carpet around some 1/4" plywood that I had fitted for the inner bed. For a final touch I added some lights and speakers in the panels.
Along the way I put ALL new seals in all of the doors, did away w/ the old slides for the rear upper door and changed to gas shocks, spent some time making SURE the rear area of the Bronco was rattle-free, took some time aligning the upper rear door & tailgate. Now it seems much quieter for daily driving....and of course, NO rattles, NO exhaust fumes, and very little road noise.