I had a crazy idea to create a 'Mech that can take ungodly amounts of damage:

200 Tons
1/2(1) mp
75 tons Hardened Armor (CT Armor 70/50)
2 ELRM 20
8 tons Ammo
4 ER Medium Lasers (in .5-ton Turret mounting)
Targeting Computer (1 Ton)
Talons
2 C.A.S.E. II
13 DHS