Further update. Got hold of Wade today - he received the long-awaited tubing merges last week and is currently building our order of headers. After all this time, this is grounds for serious woo and hoo.
Duc2V4 and I will be going over the list of purchasers during the next few days so we can get shipping estimates together for everyone, order gaskets for those who have requested them, and arrange to drop off the pipes at the passivators when Wade is done with them.