For those how want to know before watching the video, the fighter wings are claw + 3 warthog.
Legions are dope, and have great weapon slots for taking advantage of the current over-tuned weapons! I've always preferred the weapon layout of the normal over the XIV, even though the XIV has better stats, and having medium missiles this version for PCLs is a strong boost.
My "usual" build for Legions is Mjolnir + Mk IX, but between Ordinance Expertise and Tech it really does have the flux to run double Mjolnir! I often don't have the points to have tech on top of my combat skills - especially as you are running industry 5 as well! I'll see if I can get it to work out, but I can put a lot more caps on without needing flux distributor (or even max vents tbh!). I really like armored weapon mounts for the recoil reduction (and armor), but its less needed with gunnery implants.
[Edit] Oh wow the shield arcs from S mod extended shields are really nice there! I should try that on my Onslaught build...
[Second edit] And I know you dislike PD, but I think 2 more of your legions would have lived with even light PD! A single reaper to overload and another to kill for one of them, and shooting down even some of the hammer barrages from the other. It wasn't really a saturation missile attack, just the PCLs being out of ammo not sweeping the sky. (Between ballistic mastery, CR, and S mod ATG, you're already looking at +45% damage to missiles, so even a pair of wing vulcans, leaving the dlacs in place, might have done it!)