Update Dec 28 2005
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Pistol grip from CONUS and Autoback bolt from HK are still in customs - serves me right for ordering during Dec!
However in the mean time I have gotten both sides riveted, as well as the last big hunk of superfluous aluminum hacksawed off. Turns out on the lefthand side of the reciever there is about a 2mm gap between the mechbox and reciever. Which means that you don't have to be quite so meticulous with getting the rivets flush on the inside, and saving some file work if you're the lazy sort.
And yes, I couldn't wait so I did lay down a layer of matte black.... Just have to router out those magwell dimples and the reciever should be gtg.