Once the frame was up, it was time to put down the floor boards. This was the easiest part. Since I designed the size to work with standard size lumber, all I had to do was lay them down in place and screw them in.
Around the tree trunk there were some boards that still needed to be cut. So I measured for those and cut out enough space around the trunk so that it could still have room to grow.
Once the floor was complete it was ready for the side walls, railings, and custom-built ladder.