CRZ, Here are the measurements for the tv stand I made.
1" thin wall square tubing: Base is 23"x23" (four legs welded into a cross). When I welded the base the tubing was cut and then welded in such a manner that the welding arched the center up. That way the tips of the legs touch the ground. I then welded a 10" section of 1 1/4" thin wall tubing to the center of the base. It would be better to get a piece of 1" id tubing but I used scrap that I had laying around. After checking that everything was square and the stand sat level, I took a 40" section of 1" tubing and welded the extra wall bracket to it. I drilled a 1/4" hole through the base and upright so I could slip a bolt though to hold the base and upright together. To store I just pull the bolt and then the upright from the base. It is very light and portable. The only thing I think would make it better is to drill the legs and weld on 4 nuts so bolts could be threaded up or down through the legs to level it on uneven ground.
We used it all weekend and it worked great on level ground with a 40" flat screen. I could move the stand around to keep any glare off the screen.