Indeed.I'm not too sure, but the shack kinda looks like its actually flat and sculpted in a relief style that make it look like it goes further back than it actually is.
Someone posted a video of one of the original Imagineers of Splash going over it's construction and he mentioned many times that the space for the dioramas is surprisingly shallow, especially since they had to leave room for guests to evacuate when the ride goes down or there is an emergency.
So... both the original Imagineers and the current ones have to create illusions of depth.