I was thinking back to an old centurion build I ran on the CN9-A. With the realization that the PPC and ER PPC do the same damage as an AC/10. I decided to see if I could bring the build to the CN9-AL variant of the centurion, and this is the result. Due to the ER PPC you have the range to reach out and touch some one, but don't have the 80-90 meter minimum range of the regular ppc.
If you are going to brawl with the ERPPC oh your heat level would spike so you should switch to a normal ppc.
PPC is not the best brawling weapon, ER or not. For a brawler I'd mount 2 MLas instead, and add a second SRM (see that build). If you want to keep with your weapon loadout, no problem. But I think you have too many ammo for a single launcher.