I am generally a fan of the 1911A1, where customization comes easy and the bug to do it bites most hard, but even I cannot understand modifying the entire grip of a weapon just because it was mismanufactured to begin with. Buy a weapon that fits better.
It is way past due for Glock to have done the following, (some of which they have notably undertaken):
Allow for swappable backstraps. (They should act more like Microsoft and just rip off good ideas from elsewhere, or would that make them seem too much like S&W?) The grip angle is the singlemost heard complaint about Glocks, but they stand pat.
Remove the frickin' finger grooves. Some people swear by them, the other 98% find them to be anywhere from mildly annoying to obnoxious deal breaker, especially when they weren't on any previous generation.
Reversible or truly ambi mag catch. As a lefty, I do just fine with the positive one sided mag catch of the 1911A1, but the Glock's squarish and plastic button has always sucked hind teat in that regard for the southpawed. Rip off H&K's paddle already.
Round off the triggerguard or at least soften the 90 degree face a little. Squared off trigger guards are so 80s.
Allow a factory option manual safety. Most other polymer pistol systems allow for it. If one still wants the original recipe, great, if not, great also. When I was a reserve deputy, I paid for my own Beretta 92FS rather than take an issue Glock for three primary reasons. One is the righthandedness of the Glock. Two was the sucky grip angle. Three was the lack of a way to disable the gun in the event of a struggle for the weapon.
With the Beretta 92FS, one just left the safety off, hammer down on a loaded chamber. In the event of a struggle for the weapon, thumb down the trigger disconnect safety to "on safe" and wrestle for control. Manual safeties have many documented officer saves to their credit, and I am aware of no report, anywhere, that a manual safety has cost an officer his or her life via "forgetting" it was on.