So I made a mock up turntable to try out different positions.
Then out came some track and I had fun trying out ideas.
My original plan made use of 30° corners with a 553 mm radius, but I have now gone with
14°26' and 902 mm radius which has thrown my plan on its head.
It sort of still fits.
I reckon with flex track I'll get it to work out.

In the first photo I have put in an idea of the round house outline.
I am planning to possibly scratch build it, with a odd number of stalls. Everybody has either 3,6 or 9 stalls, I want to be different.

Maybe 7 or 8.
There will also be one outside track.