From the looks of that stand I dont think you would ever have to worry about it failing. That is one heavy duty stand.
Yeah - I might have over engineered it a bit. Better safe than sorry and I had fun putting it together. Last time I built something with lumber was like 15 years ago in high school...and that was just a bird house, lol. Put some good use to the power tools that I inherited from my other half's family though!