The stock Trojan finish isn't great, so chrome is probably a good idea. Don't get me wrong...I love my Trojan...but if I have one complaint it's the finish.
Another vote for Tripp mags. I use the Dawson no gap basepads since I use the Dawson no gap magwell. I'd bet the standard Tripp basepads would work fine with the S&A magwell.
As far as checkered mag releases that are also drilled and tapped for a button...I don't know if I've ever seen one. I use the Dawson IDPA legal drilled and tapped release with the LoPro button when I'm shooting SS. I unscrew the button when I'm shooting CDP.
I shoot 9mm and .45 1911's in competition- Singlestack, CDP, and ESP. My carry guns are either a Glock 19 or a Kel-Tec P3AT.
I enjoy shooting 1911's more. Glocks are great for carry, but they're just not as much fun.