I have the 7 1/2" bbl Cimarron 1872 Opentop in 38 Special and I've been thinking of getting a holster/belt rig for it...I like the Opentop...
I've also been involved with bone and stag scales for knives (specifically Buck 110/112). They are very moisture sensitive. A set made in say New Mexico and sent to you on the Florida coast will almost certainly warp...
The trick is to find a knife/gripmaker near you with the same general environment...
You can try a 'stabilized' bone or stag, but it's still problematic...
...Joost my two pesos, senor Doog...