Another vote for Milt Sparks and a good belt. I carried a Colt Defender (3" 1911) in a Milt Sparks Watch Six, and occasionally a Colt WW1 repro (gov't model) in a Milt Sparks VM2. Both worked fine, the Defender was of course more comfortable, although not necessarily a lot easier to conceal. The Hogue grips on it were tacky, thick, and grabbed my shirt, while the wood furniture on the WW1 was thinner and less grabby.
I prefer the shorter barrel of a commander or 3", though.
I'm 5'10.5 and ~160 lbs, so I'm not a huge guy, either.
You just have to have a good holster and belt, and then carry yourself properly, and it's all good.
I do prefer the alu frames on a carry 1911, the weight (or lack of) is just easier to drag around.