I am new to the forum and hail from sunny Queensland in Australia.
I have started a small O gauge layout on a door. It will eventually fold up into a cupboard so the small room it is in can be used when guests stay.
To see if it would work I have laid out a test layout on the door. I still need to find a set of R/H and L/H points to make a siding and connect the turntable.
Well at least it’s a start. Now to get going on finding a cabinet maker to make the cupboard.