More flooring...
We created all of our flooring from lumber. Some purchased, some salvaged from a home remodel.
The upstairs floor was made from 2x4s to create a 2" thick floor
and the downstairs floor was made from 1" thick boards.
You can see how we made the flooring HERE.
This is the only pic I have of the downstairs flooring.
We used 1x6 inch boards for the back bedroom and bathroom floor
and 1x10 inch boards for the living/main room floor.