I've cleaned up the chamber for the inner bolt, using an exacto knife around the edges to give more depth. I've also thinned out and adjusted the angle of the bolt.
With some left over aluminum that I used for the scope rail, I cut and bent (at a 90 degree angle) a bracket to mount the counter. This seems to be pretty stable.
To mount the folding stock, I added screws to the pivot points
And also added another screw to lock in the other end
This still had some very slight movement (side to side), so I made the screw thicker using some electrical tape and added a layer of black heat shrink to prevent it from ever coming undone.
On the magazine holder, I put a large screw down the middle to help mount it to the barrel. I also put some "pins" in to mount the magazine
For added strength and stability, I've added screws and pins to the handle too.... Also made my mark on the handle, even though it will be hidden
I think I'll just pin everything!
Here is most parts mounted now for a test fit... nothing is glued as this point, only pins and screws holding it together