pic: 648 Cardboard Crab Steer Boat 1

[StevenB]

By the way, does anyone know if and how you can set custom densities in Inventor? If anyone knows, I'll post the estimated weight of the boat.

Create a new material using the Styles Editor:
-Select "Default", or whatever is closest to cardboard.
-Click "New", and type in a name for the new material ("Cardboard").
-Enter the mass properties and click Save.
-You can also edit which texture the material uses by default, as well as other physical properties.
-You'll have to import the Cardboard material into each part. I'm not sure how to do this with Inventor 11.
-Set the part(s) to be cardboard.
Hope this helps!