Great thread! Question about the stand... what are you using for the back ledger of the stand? Looks like a 2x4? supported by the center brace which is qty (2) 2x4's?
The reason I ask is because I am currently building a 210 in wall (much like yours) and I was considering using a 2x8 or 2x6 to run that long span aross the back. My thoughts were that I'd need a bigger piece of lumber to support that span so that I would only need one center brace (thus making the sump easy to access). Looks like you got away with a 2x4. Are my eyes deceiving me or is that really all you used?
thanks.... and good luck the rest of the way!