Roy,
I may be able to help you.
I have I think one of the drums that you refer to, it is a pressing with an outer flange with the spoke holes in it, drum working dia is7″.
It came with my two speeder, and is obviously incorrect for that , although it does fit the two speeder hub. I am just about to make a two speeder drum/ sprocket assembly for my bike.
Am assuming you want a drum as well as a hub, can’t help with the hub.