You HAVE to get rid of that brass safety and swap in a plastic one - the brass must weigh a TON on that gun, not to mention that it is throwing the balance WAY off. . .
I might not have gone as crazy on the rail, but I agree that the rounding at the back for the grip frame looks very smooth.
[continuing to pick nits]:
Single detent or dual? Dropping a detent might shave a few more tenths of an ounce.
SPD-style panel grips? Maybe a pair of the finger-grooved Lapco ones, just to stay away from the oh-so-heavy rubber?