Basically the frame is 2x4's with two additional pieces of 2x4 spaced in the middle for support. A single piece of 1/2 inch thick plywood is screwed to the top. The owner of the gym we go to had it upholstered for us. He used two inch thick heavy duty foam padding covered with vinyl to match the other equipment in the gym. Make sure the padding extends all the down the end where your legs will hang. The swing arm is a seperate piece. It's three pieces of tubular steel welded in the shape of an "I". The top piece is slightly shorter than the bottom piece which needs to be long enough to accomadate 5 or 6 plates per side. The dimensions might vary according to your power rack. I'll have to take my tape measure to the gym and get you the exact specs. Whoever wants a drawing and specs, IM me your e-mail and I'll send them to you. I'll see if PLJay can take some pics with his digital cam so we can post them also. If you have any further questions, I'll give you my number so I can explain in more detail.