Looks great....I considered doing a similar weldless build using Benders thread, but went into an entirely different direction. I decided to start building an all electric HERMS system like Kal's Redirecting to TheElecticBrewery.com
and devote a portion of the unfinished side of my basement for a dedicated brewing room. One word of advice.....add the corner supports IMHO.
You are dealing with a lot of weight in boiling hot liquids/grains/etc. with the larger vessels for 10+ gallon batches. The corner plates are very inexpensive and I believe are well worth the investment from a safetly perspective. Can't wait to see you fire this thing up! Good luck.