Nice Rig,
It is similar to mine, only I have a copper coil and have not fixed it into a vessel. Also none of my plumbing is fixed. This is largely because I cannot weld or cut in a straight line, but also because it gives me flexibility.
Your brewery looks pretty and will work the way you want it. A few nay sayers have given you a heads up of potential issues to be wary of, cleaning is probably the most valid out of what I skimmed through. Personally I use caustic on my stainless steel, an overnight soak and a soft wipe will clean it all quite well. Napisan and PBW works too, but in the interest of a happy wife/happy life, steer clear of taking the wife's napisan.
One thing I have noticed on my system that you may need to nut out:
The HX/Wort Chiller in a large vessel like that will be a more efficient at chilling wort than heating a mash. Well on my system anyway. Heat stick and gas burner required for 1 degree a minute mash heating.