Steiner Stalking Spider w/Earl Crowhorst+ Alternative Firing Mode
Steiner Stalking Spider w/Anastasia Kerensky+ Enhanced Imaging
"Bartleby" w/LE Margaret Yeager + Hotshot Ammo

Comes in an 598pts with Recruitment costs. Each mech will have 9 Movement, 12 Attack, 22 Defense with a 14" range weapon. Using all hindering terrain, I had a 24 defense, 25 in deep water. 4 Damage Energy weapons as well as the hot shot ammo proved very useful. Add in the 1 cooling for water plus 1 cooling for being a Quad in water, allowed me to cool for 2 each round that I took an action, or 3 cool for sitting. In deep water you can cool for 5 if you vent. Maybe swap Alternative firing for Faction pride if you dont need to double your targets.