Good stuff man. I just beat the that last room was a pain however after 3 wipe I saw that from on the left with the window and my other two friends were outside. Note: there is a spot up the stairs where you can hide behind the where you can shoot him and his splash damage won't hit you. The only problem is the ship when it comes in it will one shot you but if you can get out of the way in time then return after it leaves you can keep constant fire on boss without getting hit and let the rest of your team members take out mobs below.
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The upstairs catwalk can work well, the only issue is that adds on the right have a line of sight to the catwalk and if someone goes down up there, it's super dangerous to go pick them up. We wiped once too with about 5% left on Sepiks because we got hit by a rush from downstairs. Just gotta brush yourself off and run it again.