The arrival of rocket launchers as extremely light-weight missile weapons and Light engines makes it much easier to abuse the AC20 quirks on the AH. This particular build uses a lot of things with '20' in the name. Just chainfire the RLs and you'll be fine, even with groupfire it only takes like 50% heat. Downgrade RLs if you need more ammo or speed. Don't take the UAC20, the jams are yucky and the regular 20 gets a 20% cooldown bonus.
oooOOOOOoooooh! I am definitely going to try this; been playing with a way to use the new tech to breathe like into my centurion again.
4/5, I miss having an SRM but this build is a great alternative to other medium brawlers. Mixing this with powerful enough SRMs seems too heavy, and 3 RL20s will surprise anyone.