Slamfire good to hear from you . No Sir I have not built a Rolling Block in 40-60 WCF. It has crossed my mind a few times , but never materialized . I did build a Rolling Block in 32 LC that turned out to be a fun project . I re- barreled an old Swedish No. 1 action with a full octagon 1-1/8” x 35” and chambered it in 50 -70 Government . Was going to make into a plains rifle . After finishing the machine work I lost interest and have yet to stock it . Have not been shooting any 76 guns for a while . Do a little shooting with an old heavy German muzzleloader target rifle every once in a while and that’s about it . Good to hear from you my friend and hope yall are doing well ,,,DT