From what I can tell, the process goes like this:
-Orders open for a batch and stay open until that batch is filled (this took 45 days for me)
-Batch fills, orders close, 120 day lead time email is sent, orders are placed at stockys
-120 day estimated lead time at stockys (mine was 76 days)
-Stockys finishes your stock, update email is sent saying your stock is on the way from stockys to unknown claiming 5 days shipping time (mine was 12 days)
-UM sends confirmation email letting you know they received the stock from stocky's. This step requires your confirmation about paint / mods before continuing
-UM does mods / rails / paint / etc
-UM ships to you