James, if you look at the last picture you can see the top of a flathead screw just behind the end of the bolt.normally the screw comes up from the bottom into the tang of the receiver which is tapped.i'm coming down from the top with a flathead screw into a pillar which is threaded for it. the second screw holding it in is located on the bottom of the recoil lug.the lug is 1" square on the bottom, towards the front of the bedding block.
as for a repeater it could be done but i didn't want to bother with it.my trigger linkage runs right under the receiver and it has to be stiff for a good trigger pull.my thoughts would be to make a linkage that would wrap completely around the outside of the mag box.of course it couldn't touch it.i would try to make a box that was as slender as possible.one plus is the stock is very beefy in this area and you have some wood to work with.like you said it could be made as thick as necessary.
give me a call,i'll be around tonite or most any night and i can probably talk you through most details.i only live about 2 hrs drive from you,just above Hagerstown, Md.come on up and pop a few rounds. why am i sensing another wife is gonna be angry with me?