I Just finshed mine. Got 10 foot 4x4 post. I measured up 4 feet an nailed 2x6's around the outside. I put 2x4s across to support floor. then a piece or ply wood for floor. Outside pieces I used are 4x8 siding panels. I screwed mine all together except for floor so I can take it apart and move it. Less than 150 in the whole thing. Be on the lookout for old office chairs on wheels. That is what I use inside easy to spin around and move