Like the Stalker II, it ain't ugly and it isn't at least terrible like some previous FWL designs. Also think the latest hardened armor rule errata made the 'Mech less vulnerable to falling down since 40-effective damage is harder to achieve than 20. If i recall correctly, disregard what i say if i'm wrong.
The Carronade, yeah, needs variants. It is easy to tinker with, as long as one is willing to remove the Gauss rifles.
Since the 'Mech's supposed to be a trooper, i'd be inclined to increase durability with a light fusion engine, this could be achieved with a Clan-spec Gauss rifle and Clan-spec CASE IIs. Simple change, and the Clan Protectorate can most likely able to provide tech for such minimal changes. A more advanced, elite version could replace the lasers too. Would match nicely with what the (ugly) Juliano has.