I made a super complicated homebrew version of Mordenkainen's Magnificent Mansion. The main difference is that it does not create a pocket dimension. It's also changed to be an illusion spell that works a little bit like mirage arcane. Timmmi is an illusion wizard, so changing this to be an illusion spell lets me change the layout of the palace using Malleable Illusions.
Timmmi is also quite the trickster/prankster which is reflected in the potential consequenses when attempting to navigate the palace without an invitation.

Here is the spell: Timmmi's Illusory Palace, what do you think?