JS, your pictures have moved me to action. I found a fellow shooting buddy and home machinest with a full set of roller drawings complete with Gove conversion dimensions including full single set a double sets as well. I have a couple of things I wanted to talk to you about.
!. I notice none of the Goves I've seen include a pistol grip and the lever loop makes up for this some what. Can you see any reason why a pistol grip with commensurate fitting lever could not be used?
2. The link seems to make contact with the back of the block woodruff cut in conjuction with the pin in the drawing but has clearance on the other end in the lever. Is it supposed to make contact to relieve presure on the pin ?
3. Will the breech block spring hold up the lever if all is made and fit well with the link and pins? I don't see any thing in the original drawing like your plunger in the picture to help hold it in place with the hammer back. MD

Mdeland, All the Goves I've built do not have the firing pin retractor. The original sporters didn't have this feature so I find it not a problem. I just check the firing pin occasionally to make sure it still moves freely. I've fired many thousand rounds through different rollers with never a mishap with the firing pin. Like any firearm just clean, respect and check. Jerry

The Gove underlever Rolling Block makes for an attractive rifle when you see it fully stocked.  Here is a picture that shows the Gove in a sporting configuration.  Enjoy

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Another,

MD, Used solid solder from Lowes, the no lead stuff. I've had good results with it. Jerry

MD, I use a short piece of threaded oct barrel when I machine the tops oct.  I have a threaded piece for large shank and one for small shank. Snug them tight. The finished Gove is machined and has a 1 1/8 inch straight oct barrel. The unfinished Gove is an original sporter action with a Pedersoli take off that is a little bigger than no 4 size. When machining the top of a military action I try to leave as much meat around the barrel as possible. Just so corners mate up. Don't really try to machine to specs of original sporter just close. If using a larger than normal barrel I have machined them flush. I use a carbide 1/2 inch center cutting mill in my vertical mill. Jerry