There are two different sizes of the miniature house and each has two different versions (normal and hollow).
The small house has a base of 50x50mm
The big house has a base of 80x50mm
The normal version of the house is solid and can be printed with infill. Use the normal roof for this version as it has a plane inner face. Simply glue the two parts together.
House small + roof small
House big + roof big
The hollow version of the house only has the floor and walls left to save filament. Use the roof hollow version for this as it has a catch on the inner corner to fit the hollow house. Simply glue the two parts together.
House small hollow + roof small hollow
House big hollow + roof big hollow
Bavaria Filaments PLA white and red
0.2mm layer hight
on Prusa Mk4