Nice build. Noticing those nice armor quirks, I was able to fit in another half ton of MG ammo by removing most armor from the head and a teensy bit from elsewhere. I haven't played this Flea yet, but I feel like a ton of MG ammo wouldn't go very far...?
Each MG fires10 rounds per second. With 2 MGs, it means it will fire 20 bullets per second. Even without ammo skills, 2000 / 20 means it will take 100 seconds (1:40) of continous fire to run out of ammo. With full ammo skills, it should be 2400 / 20 = 120 seconds (2 minutes). My sweetspot is 1:30 seconds of uninterrupted fire, so IMHO an additional half ton of ammo is not needed.