Did some carving today:
Much better than the original papier mache versions. Studied the heck out of those formation through old photos. The amazing thing is is that these rock formations are still at the park today.
The aluminum sheets have been covered with a layer of Papier Mache (Paper towels dipped in 50:50 ratio glue and water). Still need to do a bit more and patch some areas (where the structures for the mesas/buttes use to be, before I decided to do them out of foam).
Gonna work on the 2nd natural arch bridge tomorrow! (The one that the train doesn't go through nor the mules go over)