The Chassis of a Support Vehicle, Combat Vehicle or BattleMech is what the rest of it is built around or inside. Similar to the Human Skeleton a units chassis has a major influence on the shape, structure and form that a unit will take.
 Internal Structure
Generally, Standard Type Chassis consisted of a foamed aluminum core covered with various composite materials, wrapped in silicon-carbide fibers, and clad in Titanium-Alloyed Steel . Standard Internal Structure can be formed on a planets surface without requiring (expensive and vulnerable) orbital facilities.
Endomorphic-Steel Chassis are formed in orbital facilities. The Alluminum Core is foamed in Zero-G and is bulkier than that of Standard Internal Structure, covered with various composite materiels that are mixed and hardened in zero-G, and clad in a Titanium-Steel Alloy formed in Zero-G. .
- Note the added Chassis models are produced in Clan space.
Chassis are manufactured on the following planets:
 Inner Sphere
|Earthwerk Trooper II Endo Steel||FLE-17 Flea||Earthwerks Incorporated||Asuncion
|Corean Model KL77 Endo Steel||HNT-171 Hornet||Kallon Weapon Industries||Talon (Wernke System)|||
- ↑ Tech Manual, p.32, "The Frame"
- ↑ Tech Manual, p.31 - "3rd Paragraph"
- ↑ Technical Readout: 3050, pp.50-51
- ↑ Technical Readout: 3050, pp.52-53