First post here because I (could not believe that I) did not see this build listed anywhere, and I do not know if it is embedded as an alternate build in someone else's topic (am I really expected to open and look through *EVERY* single topic to check? ). This is my short range tinkering with the CN9-A(C) I got for free back when (after I originally mastered it with 2x LRM5+A, 2x MLas, and AC2, for long range assist and harassment): Alternate build is to swap STD250 and FF armor for XL275 and standard armor, allowing for more DHS and/or ammo as needed (or you could toss on a single MG or AMS):
I think stripping the arm armour is a bad idea, using them as shields is the strength of the Centurion. By sacrificing a bit of speed we can keep the durability and the fire power: I'll give this a rating once I've tested the chassis!
Light Engines are a thing now (Remove a bit of ammo + get missile rack skills to bump the armor if you want)