Been working on a few other personal projects so had a bit of a rest from Babylon.js.
Just started a new 3D project. A dynamic world builder 
Currently limited to x 10x10x4 grid.
If you want to create and edit your own building, just change the building variable on the url to a higher number.
You can move the editing cell to the cell you want to change using the arrow keys. You can change the cell style by using < and >. You can move the editing cell up and down a level with U & D keys. If you want to reset the building press /
Still lots of error checking and further coding required. It might unexpectedly break whilst your messing with it.
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Need to sort out the editing movement so that the editing block moves correctly depending on which direction you are looking. There must be a camera function to return degrees or radians.
Uhm, sorry if am being dumb here but I am not sure what do. Am I supposed to spawn in an empty building? Or should there be an art gallery? I can see a green box that I can move. 
Its ‘very early’ days in the development. Picture hanging is not implemented yet.
My previous gallery versions are at https://ukcpg.co.uk
“If you want to create and edit your own building, just change the building variable on the url to a higher number.
You can move the editing cell to the cell you want to change using the arrow keys. You can change the cell style by using < and >. You can move the editing cell up and down a level with U & D keys. If you want to reset the building press /
Still lots of error checking and further coding required. It might unexpectedly break whilst your messing with it.”