I built my 16' x 22' Lionel O gauge train table from 2" x 2" aluminum extrusions manufactured by the 8020 Company. I was concerned that all the aluminum would interfere with the wireless signals being sent to the engines, etc., but there ended up being no problem at all. The framework bolts together with right angle brackets as pictured, and is extremely rigid. The legs have height adjustable leveling feet. Turntable is operated via laptop computer.