Built this to take full advantage of quirks. The LLs and MRMs compliment each other perfectly, and maxing out heat/survivability skills help you manage toastiness and make better trades. The LL cooldown is insane, making for quick pokes.
Have been doing a similar build myself. the loss of the DHS isn't worth the speed I suppose but I an vouch that this weapon combination on a small thunderbolt instead of a big banshee is menacing
Pro XL version: faster, less ammo (still 20 alpha strikes with max ammo skills, though), shield arms to compensate XL engine, sligthly higher maximum and sustained dps, sligthly better spread. EDIT: and because I'm the 2xMRM20 > 1xMRM40 evangelist
I built something like this due to the quirks too, though I used smaller MRM's because of the limits of each missile hard point only shooting 10 tubes at once. That's the limit on one of those Thunderbolts, anyway: _
MRMs are fired sequentially anyway, so the launcher tube count shouldn't make a large difference I think