Here’s an actual limited-space situation we ran into this past week. From the side of this house, there is only 15 feet to work with before we are limited by a 5-foot set back restraint from the neighbor's property line. Allowing for walking area next to the house, that doesn’t leave much room.
Generally, pool builders show photos and 2D drawings to folks considering an investment in a pool or remodel. Of course those are helpful, but 3D modeling is a whole new world.