One major screw up on my part was making the floor 4 ft. x 6 ft. I than realized four feet is not enough room to draw a bow back. After a little study we found that five foot would be needed. Not wanted to pull it down and start over I decided to improvise and angle the walls outward. I used and angle that gave me a five foot wide demension at waist height and six feet at the top. Not being a carpenter or architect I was a bit worried about how it would come together. We put the four walls together on the driveway and they fit pretty good. But when we finally were able to pull them up the tower with a rope they fit like a glove. I was amazed at myself (Lucky no doubt).