Cost of hull structure for different materials

Interested in cost of structure, USD/kg for different materials (including labor, material, other expenses). Sure this all depends on region, but this is what I got:

FRP (CSM) mass production in mold - 8-12 UDS/kg
FRP advanced, custom made - over 20 USD/kg
Wooden laminate - 14...20 USD/kg (?)
Steel, thin plate structure, welded - 4-7 USD/kg
Aluminum alloy, welded - 6-10 UDS/kg

Any comments?

 

1) Wooden laminate seems very low. That's just a hunch though.
2) Are molding costs included?

 

For FRP mass production - yes.