Received (most) of the back-ordered parts I was missing, now I'm only missing:
Bag 1145 - This is the bag that was missing from the original order, though not marked as back-ordered, Vans indicated they would ship it 4/29, though haven't heard anything recent there so I sent a reminder email
Bag 1001 - I recently received this as part of my backordered parts (Invoice 193894), and I am missing the following items from that bag:
Qty 2 - HS-911-PC
Qty 8 - HS-912-PC

So I finished the rest of the inventorying of the parts, then continued with finishing deburring the stiffeners and the Rudder horn - lots of time on the 3M wheels, and then a bunch of hand filing/scotchbrite pads to get the last mile. Finally got everything all debburred though so I can now get on to more exciting build tasks (plus, with the news parts, I can pick up on the Vertical Stabilizer where I had to stop prior).