It is thick, I am holding my Gold Cup. It's just big or bigger!!! There's nothing compact about 45!! OP wants 45 and max rounds which is 10+1. If I carry out, it's going to be 9mm or smaller, that's why I just got my Glock 26. If I were OP, I would consider .40S&W, now you talking about smaller 10+1, light and all that.
I know his feeling, I am going through it right now. Also remember, 1911 is single action only, you can only do cocked and locked. It's dangerous. No choice 40 years ago, not a good choice now for carry.