Confused on Heater Control Valve for 1975 Duster 360

so I mocked it up to try and help myself figure this out.

From the Intake Hose Nipple which is 1/2 to the Heater Control Valve inlet which is 1/2

Heater Hose Mock Up #1.jpg

Then from the Heater Hose Nipple Outlet which is 5/8 to the Heater Core 5/8

Heater Hose Mock Up #2.jpg

Heater Hose Mock Up #3.jpg
Then from the 1/2 Heater Core back to the Water Pump 5/8 Nipple (the silicone heater hose stretch's easy and I can make that happen)

Heater Hose Mock Up #4.jpg