A little something for the children:
You should have no problem with the climber and other mods you may already have. There are 2 maps for the sandbox: one with the original rooms and one with Lewanda's Blue Kids Room.

*Remember to save/rename your original files before installing any mod.*

If you already have the pool upgrade and still want the climber, just rename the pool.png to something else and it will be "invisible" to the game. I'll try to fix the color of the sand around the climber later.

Enjoy.