This is a 3D Block Out of a map I sketched out while on vacation a few years back.
I used pencil, pen, and graph paper for the concept pages; then, I used the Block Out Plugin for Unreal Engine 5 to build the 3D Space.
Each grid square is 2mx2m
Aerial view of the Map
Side view with hidden wall panels
Side view with hidden wall panels
First-person view from the center of the map for scale reference