This is a light hunter build designed to stay with the Assaults and Heavies and either destroy or scare off the lights as they come in to harass. We typically use a Shadowhawk for this, but I'm trying to find a use for this egg...
If this game was all about hunting Lights. Nowadays with all the Wolves, Crows and Dogs running around, it is important imo to pack some Firepower against them. This build here is very niche imo.
Mine initial build is quite similar. Blagg Zear's SHD-2H "Skirmisher" build was the inspiration--only I replaced some of the "Light Hunter" LBX ammo with machine guns and MG ammo:
Yeah, I think the MGs make this build a bit stronger, and it becomes a cleanup and anti-light mech. Good compliment for the big boys though. You could squeeze in a little more ammo for the LBX by shaving a half-ton of armor off the shield arm.
I am not convinced by the LB 10-X here. Maybe a combination of AC10, 2x MG (half a ton of ammo might suffice!) and triple SSRMs?