I wouldn't trust EMT unless you use something over 1" maybe. Even then EMT is far too soft and can be bent easily under stress. My stand which I've used for 7 plus years is made of 3/4" GRC(rigid). The top rail is 12' with a coupling in the center and there is very little flex at all. I weight 190-200lbs. You may be ok with 1/2" GRC although I'd suggest moving up to 3/4".
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