I measured the size of the wood pieces that I would need by laying out the figurines.
The floor is 10.5cmX2.5cm and 0.3cm thick
The two side pieces are 2cmX2cm and 0.5cm thick
The branches for the roof are 7cm long for each side (I used 4 branches per side to give the same width as the side walls (2cm) and one small branch 2cm long for the centre beam.
(Optional) I had originally meant to add a back wall as well but thought that it looked better without it. This would be the same length as the floor (10.5cm) and wide enough to fit under the roof.
I then used a watercolour paint to stain the wood a darker colour.