It has been some time since I have given you a progress report.  Well after days of working on the Martini Henry breech block I have put it aside.  Yeah, when I got it and compared it to the Swiss one it looked like it would work.  I trimmed the sides at the pivot, shorten it up so it would close in the reciever, even made the pivot slightly tapered so the screw would fit.  Well the problem is the position of the pivot screw and contouring of the back of the breech.  On the original the hole is lower with the contour going down from the top of the breech, this in effect raises the top of the breech in the action in the closed position.  The MH, while really close, has the hole and the contour higher, which in effect lowers it in this receiver.  Net result is that the breech when closed leaves a portion of the cartridge base visable and not covered, like about .125 or more.   

The problerm with converting the original block and striker has a few issues.  Even though the flange on the striker is not wide enough to reach the new center for the CF pin when a hole is made for the CFP you will come into contact with the flange (.084 drill bit).  I figure you will make a .024 nick in the lip.  Since the original channel for the striker has limited clearanced a relief channel has to be cut in it so there is clearance for the addition of the new CFP and weld material.  The problem I am wrestling with now is how to jig up the striker with the new CFP balanced on it, maintain alignment and weld it.   

Right now option 3 is to make some rim fire ammo using 22 blanks as the primer, while I figure out how to jig this conversion.

Having a pro do this is an option, it's looking better all the time as my efforts have been going bust.  Well, the idea of making rim fire ammo was a no go.  When I test fired a empty cartridge in the Swiss to see where the firing pin would hit, it exemplified rim fire as there is where it hit on the Lebel brass, about as close to the edge as possible.  Mocked it up, drilled a hole touching the inside edge of the case and inserted a 22 cartridge in there to see where it would come out.  They weren't even close, I am not sure if I do move the hole close enough for the rim to get to the edge I may be through the side of the case.