I've noticed that you can't place a support right next to the spot above the entrance to the cave, yet I can place one right in-front of the entrance no problem.
Also it slightly irks me that the opening there is only wide enough for the normal elevator and not the freight elevator. Makes sense from a game design stand point, but it just bothers me a small bit.
Also saving doesn't save all the playable character's weights, just the currently active one's, which also bothers me a small bit.