Download Mech Constructor: Heavy Robot Free Unity. 

The pack contains more than 20 prefabs, that will let you assemble multiple upgrades of this heavy mech. The parts are extremely easy to put together – just drop them into the corresponding containers and they’ll snap right into place.
The poly count of mechs varies
from 1.7k to 2.5k tris.
The textures vary from hand painted
4k diffuse atlas, which looks good
even unlit, to the set of PBR maps.

The pack can be greatly expanded by
The Light and Meduim Mechs,
The Spiders and Tanks and
The Humanoids assets.
All the parts are fully compatible.

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Mech parts:

– 3 levels of Legs
– 5 variations of shoulders
– Cockpit

Weapons:

– 1-barrel Flak (5 levels)
– 2-barrel Flak (5 levels)
– Guided rocket launchers (5 levels)
– Guided rocket missile