I just made myself a belt recently ( about 2 months) following the basic advice that Lobo has given, above, with the exception of the way he cut his strips from the hide. I never thought of that.
I am very happy with the results and have gotten several requests for belts when they saw mine. For a few weeks I carried a full size XDm .45 on it with a double mag to test the belt. That's 40 rounds of .45 and a pistol and 3 mags total. Heavy.
It has been solid, with no sag,and the gun sits tight to my side. At first it felt odd, as it is like wrapping a barrel hoop around your waist compared to a typical department store belt, but you get used to it quick. I won't ever wear a store bought belt again. Also, I wouldn't go too light on the leather weight. A little extra thickness is a good thing.