Packing Iron is a great reference. I've made a lot of holsters using the pictures in it as an inspiration. It's also a good study for how leather was done in the 1800's. I also have a couple SAA's that are good for more excuses, ah, inspiration to make leather stuff. Here's another pic for a little later in the century, inspired by the cover on PI.
The pistols are really great. They are the New Model Armies (aka 1858 Remingtons) with R&D cylinders. With the right loads, they're tack nailers. Great feel and balance, too. A little filing and such and they really look like the real item. Best of all, they're a good excuse to make leather for the 1860-1880 period.