Difficulty: either learning how to weld will make this a bit hard, or having someone weld for you will make the cost go up. You also have to know how to use a rivet gun, a power drill, and a tap wrench. On the other hand, you probably could substitute metal epoxy for the welding, since it's not holding much weight...
Step 1: The base.
Took a scrap of sheet steel, probably 1/16 thickness, and bent in into a C shaped channel that my Zen would almost fit into, except for the control buttons on the side.
Then I ground out the gaps in the edges of the C to allow the buttons to fit.
I took a scavenged hinge and, after a failed attempt on one end(a crappy weld) I managed to Oxi-acetaline torch weld it onto the other end of the C.
Sorry the pic is sideways. Grink! goes my neck.