Thanks for all the help guys!
Unfortunately, the red cab is junk. All of the areas that were troublesome before began to soften back up. On the other hand the "crater cab" (green one pictured before) is in usable condition now. So this project is back to moving forward. My original plan was a farm truck that was a little banged up, so I think this cab will work now. At least it's dry and not soft.
The bed is mostly done. I need to paint it before I install the belt, and I have to install the belt before I can install the spreader assembly. Then I can finish with the hoses.