Garage for small wooden trains

This is the small garage made for my 3 years son. It can be connected to the (Brio) train track. The space is made only for one small train. Feel free to modify the attached Freecad file. The garage is made from one piece and it is relatively massive (over 100g).
It can be printed without support - but the roof from bottom will not be very nice (however it is not normally visible) and it will make strange noices when approaching here. :-)