I have done a couple, and there are always one or two in progress.
One is a simple, "Fun Gun".
It is my favorite single action. A stainless Ruger .45 Convertible Flat Top with a ejector rod length barrel. The .45 Colt cylinder is pretty much never used, though it is kept around in case of ammo shortages, hunting, etc. That said, I have plenty of other more appropriate handguns for hunting. This single actions is used pretty much exclusively as a .45 ACP.
Since I shot USPSA for many years using a .45, I have a good supply of 200 grain lead SWCs around. The cylinder throat on Rugers are well known for not accommodating such loads, as well as needing reamed to be consistent. Mine was no different, so mine was reamed both for consistency and to accommodate the added length of a proper SWC.
As it comes from the factory, these smaller (medium frame) Flattops come with stainless steel grip frames. I wanted to lighten it up, so it now wears an aluminum one. It also wears grips from Lone Star Custom Grips (they look even better in person).
The hammer was replaced with a Bisley hammer both for feel and aesthetics. A Belt Mountain locking base pin was installed. The factory one kept walking out, so this was a both for looks and a practical feature.
The weight of the little .45 ACP is pretty close to that of a Colt Single Action Army. It is a pretty handy little thing, and I use 1911 mags as speedloaders in the field when I carry it.
Milt Sparks Holster
Fun little "Jack Rabbit Safari" handgun.