How do all, trying to see how much interest there would be in a conversion kit for the 1860 Army and which style would be preferred by the potential customers.
Early Richards style with the rear sight integeral to the conversion ring, or
a Richards-Mason type with the hammer remaining unaltered and the rear sight staying on the hammer nose.
In a Richards, after mounting the ring you'd have to cut the load channel and cut down the hammer nose.
In a Richards-Mason you'd mount the ring, then cut the load channel.
In either, the firing pin will be mounted in the ring with a ferrel.