Nice work. I'm in the final stages of installing Vintage Air in my M1028 rebuild. Just a heads-up - The kit comes with a length of 2" flexible hose for the defroster vent ports and 2-1/2" flexible hose for the cab vents ports. The VA instructions indicate to cut the 2-1/2" hose to certain lengths for each of the four (4) cab vent ports, with the hose stretched-out when measuring. However the length of 2-1/2" hose that came with my kit was insufficient for all four lengths of hose. I emailed VA customer support about this and they shipped me another full length of hose at no charge, and they didn't question my request so I believe they are aware of the deficiency. Also, you may find that the radiator hose which runs from the pressure (cool) side of the radiator to the lower port at the firewall needs to be 3/4" diameter at the radiator but 5/8" diameter at the firewall. VA offers such a transition hose through Summit and other outlets, VA part #99010,
Something else I did when installing the flexible duct was to install a small sheet metal screw over the last internal wire of the hose after it was stretched over the air duct port. The hose must be squeezed to a tight oval shape to fit over the duct ports and getting all four installed on the supply plenum was a bear. A sheet metal screw run into the plastic duct port over the internal hose wire will prevent a hose from popping off a duct port after dash reinstallation. I recommend taking out the defrost ports and installing the hose in your lap instead of trying to install the hose with the defrost ports in place.
Hope this help.