I printed in 200 micron layers.
You may print the last layer of the floors in "Concentric" to achieve the effect shown in the picture.
Do rotate the file for optimize printing.
All walls have raft build in, do remove them before assembly.
Support needed, but you might minimize the support if you set the support angle at 60 degree
Will require printer with 300x300 (XY) print area.
Parts required superglue. Pegs are designed for optimize assembly.
It is good to have a M3 tap for tapping the thread for fixing the chimney.
The middle floor expansion can be downloaded from: