You will invest quite a bit of time designing and making your holster or other project. My thought has always been, "If you start out with crap, the finished project will most probably resemble crap also".
The link you provided had a very good and probably honest description of what you were buying, but there were a couple of red flags for me personally. "Import", Fat Wrinkles, "Few Scars" and the cheap? price. (not sure whether that is per foot or the whole shoulder.) If it is for the whole sholder then it is cheap....not inexpensive,...CHEAP. If it is by the foot then top quality USA Wickett and Craig would be a couple of bucks per foot less expensive.
It's your time and your reputation, but for me, I wouldn't squander either on cheap import leather.
Paul