I red circled your build a little, hope you don't mind.
MAD-5M
It isn't a bad build but there are a few considerations that could be made.
Removing case, which has been mentioned, is a good start. The way I have the ammo set up reduces the chance of an ammo explosion outright killing you without case. (also think about how badass you'll feel sitting on a literal ton of ammo) I also moved two of the JJs to the CT, which while they can be destroyed or critted, shouldn't matter. Moved your cooling into the now empty side torso. Those arms tend to fall off, you want to try and keep that dissipation going during the brawl, even if you only have the 20 left. I used the extra tonnage for a little more engine, and if it were me I'd drop JJs entirely for even more engine. You need that speed to close the distance and get into murder **** range.
Practice your "bird walker wiggle." Twisting a little from side to side will let you spread center mass damage across 5 of your components.
Use the left side to shield until it blows up, you lose some of your cooling, but it won't matter because you lose those two lasers. Once a ST is destroyed you can use it to soak damage. Destroyed sections only transmit a small amount of damage to adjacent components, and the Marauder is one of the better dead-siders in the game. Once you get down to structure on the ct, start giving them the other side.
Edited by Prototelis, 04 May 2018 - 12:38 PM.