I didn't know that Taylors was having this one made by Uberti until I saw an ad for one on Gunbroker. And according to their website, they actually have them in stock. It is essentially a .45 Opentop with an 1860 barrel including rammer (except there is an Opentop style sight on the rear of the barrel). There is no ejector, but the rammer has a hidden poker in it, similar to Cimarron's MWNN.
Also noticed Taylors has a "Hickock" Opentop, which is a 3.5" ejectorless model in .38 or .45 (Coffinmaker wouldn't even have to saw these off), though those are not in stock.