Kydex is a heat moldable plastic sheet and can be purchased easily online. It is usually used for knife and gun sheaths. The dificulty here is that I was unwilling to direct a heat gun at my expensive new phone in order to form the plastic.
A few basic tools, a couple of steps, and not much time and I have a descent looking case that I think avoids the "overly connected self important business person" look.
tools: plane or belt sander; table saw or hand saw; drill w/ bits; random orbit sander or sandpaper and block; heat gun or oven; rivet setting tool; spring clamps; chisels.
materials: scrap lumber; Kydex, I bought mine at knifekits.com; rivets, again from knifekits.com; instant glue.
Step 1: Making the blank
-measure the thickness of the phone and plane the board to match
-rip the stock to equal the phone or add a couple mm to the width if you don't want a super tight fit.
-cut the blank to the same length as your phone
-glue on extra wood anywhere there is an irregularity in the phone case
-shape the thick parts of the plank so they look like kinda like the phone