Slight threadjack, but since this is a Davis hybrid thread...
Here are three that Davis built for my father. There were good friends, and shot PPC together.
Top is a Model 13 mated to a 581 barrel. Why? No idea...it was a birthday gift to my Dad. Bill probably built it out of parts he had laying around.
Middle is his "Cougar." Ruger Security-Six frame mated to a Python barrel.
Bottom is his "Rattler." Ruger Speed-Six frame with a Colt King Cobra barrel.
All three have unbelievable trigger jobs on them.