Rapidrob, thanks, that looks pretty spiffy!
I'll have to try out a doublestack 9x19 1911 to see if the grip works for me, and then order one of those when the budget allows.
Both rounds feed from the same magazine, right? Is it a proprietary RIA mag or is it something common I can buy a couple from Midway or wherever? I'm mostly a .45 compact 1911 shooter, so a non-.45 double-stack full-size is pretty far from what I know anything about