with the lower now fully assembled. And dies have been obtained for producing ammo. Interestingly, bullets of suitable diameter/weight seem available, but little in the way of loaded ammo. Still looking for some of that.
Leigh, that clevis pin idea worked wonderfully, no problem at all installing the pivot pin.
Picture later; right now I'm for bed.
Added: here's how it looks
After having watched son build/work on some AR firearms, I ought to be less worried about screwing something up here, but I'm not. I do have a Claw upper-receiver block for assembling it, which should help. I have a good scope, need to get some rings to mount it with.