Brew-ta, very nice setup. Be careful with that side swing tippy dump. It seems like if it were full of wet grain, it has the potential to topple the stand. I mean, just be careful because you might actually want to clean the tun while you're boiling and that would be bad, mmmkay. Duh, you know that.
My only other comment (only to benefit those copying your design) is that you could have compressed the overall height by a few inches if headroom is a concern. You only need the next tier up to be high enough for the drain to make it over the lower vessel. If you're willing to put an "in" port in the next lower vessel, the height difference can be even less. Finally, with a pump in the plans, the BK doesn't have to be high enough to gravity drain to a fermenter. With all those considerations, it's possible to keep the MLT at a height to stir the mash while standing on the ground.
Don't take this stuff as criticism, just potential alternatives in design. The sculpture is awesome.
Holy crap, I just noticed you used the 32 tip burners. That's more heat than the space shuttle's main engine burn.