Then I glued and screwed the 3/4"x4" seat supports into the notches in the side rails, checking everything to make sure it remain square. The small angle brackets will be removed later.
At this point the cabin bottom will be straight and true.
The entire process took about an hour and a half. I let the glue dry overnight.
Next, I laid out the cabin sides and glued and screwed them together. The Plastic under the frame prevents the wood from being glued to the floor.
Next, I glued and screwed the cabin sides together and inserted the brace across the back
After drying, I glued and screwed the cabin sides to the floor assembly.
The diagonal bracing is temporary until the glue dries.