Nice job. I prefer the new look. Before you get too excited modifying the grip safety fit, take a look at my Ed Brown. This is stock factory fit.
I did a similar project last Spring recovering from foot surgery. I have a SA Black Stainless Loaded. I didn't like the trigger, so took the gun apart and worked on the hammer/sear/disconnector using the information here on the combined 1911 thread.
Decided to change out the parts, so got replacement parts:
Springfield Armory Black Stainless modifications
From Ed Brown
#897 Hardcore® Hammer, Stainless Total: $54.95
#819F30 Drop-In Maxi-Well, Flat, Checkered 30 LPI, Stainless Total: $75.95
From Brownellsescription
Quantity
160-116-135 SP501159B MAINSPRING CAP $4.38
965-011-171 R17S MAINSPRING HOUSING PIN S/S $2.95
965-011-166 R16DS MAINSPRING CAP PIN S/S $2.95
965-011-211 R21S HAMMER PIN STAINLESS STEEL $2.95
087-811-000 811 1911 MATCH DISCONNECTOR, 16.95
087-812-000 812 ED BROWN 1911 MATCH SEAR 19.95
087-805-006 805 ED BROWN SLIDE BUFFERS, PK 5.95
$186.98
Also added Nill palm swell grips.
The grip safety is stock, unmodified.
What I discovered in my work was that adjusting the sear spring first might have lightened the trigger without the replacement parts. Oh well. My SA is now my project gun. Any time I get a wild hair to try something out on the 1911 I'll probably work on it, unless I need to get a Mil Spec or Colt or something.......