Ok, well an early weekend update. Assembled the first light this morning 
I fabricated the frame rails from 3/4" aluminum angle because it’s the cheapest 4’ length available at Lowe’s. The entire assembly is 19.6" in length and 10" wide. I’ve got frame holes for chain-style hanging.
I intend to use the AUX 12V supply to run small circulation fans in the veg area, but I loaned my crimper out and still don’t have it back. That’ll get connectorized to mate with the fans.
Dimmest sustainable setting (dims to OFF but startup below 50mA is sketchy because of the cooling fans):
Nominal design intensity (1.4A):
Cheers everyone have a great day! Hopefully getting some work done on the veg partition and ventilation system this weekend but busy with family stuff so we’ll see how much gets done 