A conundrum

This variation uses a wider Price Canyon module and the 6 inch gap between Price Canyon and Provo is filled with an oddly shaped piece, but the turnouts are all #6s. The staging has 6 tracks on 2 inch centers and no need for a reversing section.

The backdrop along the right side of Uintah ends flat against the wall and does not bend across the bottom of the Uintah module. This leaves all the turnouts along the back of the shelf with easy access from the Prince Canyon end and from the Uintah aisle. There is a view block hiding the tracks leading onto the Prince Canyon module and separating them from the Weyerhauser plant.

Tracks looping across the bottom of the Uintah model to PMC, and the tracks above the Weyerhauser plant to the logging camp both have a 24 inch radius. The tracks along the right side of Uintah module have been slightly modified from the configuration you had originally proposed in order to bring the tracks from Uintah, across Price Canyon, and onto Provo staging carts as far to the left as possible, so that the staging tracks use as much of the 12 feet long tracks as possible. The 2 #6 turnouts at the bottom of the Price Canyon module are positioned, so that, where they abut each other is exactly in the middle of the Provo and Moab modules. These 2 turnouts run at a slight angle in order to reach the staging tracks 1,3,5,7,9, and 11 inches from the bottom of the plan and that angle introduces several slight S-curves formed by the two TOs where they move from Moab to staging.

Edited on 12/4:
Ideally, there would be a perfectly straight track running parallel to the bottom of the Moab, Price Canyon, and Provo modules with a centerline 1 inch from the bottom of the plan (assuming there is enough space to get your fingers between the side of a car on the track and the wall, so you can re-rail cars and use the staging carts as a fiddle yard).
Both tracks curving from Moab to Price Canyon have 24 inch radii. The end of the track just above the Engine on Display may need to be shortened a little to allow clearance for the 24 inch radius tracks.