I know what you mean packer, And what monty said, is what he wants.
Example: he wants to create an item, Say.. Like the box from the Gravity Gun mod, You can not pick it up, move it in anyway (except for with the gun, but that doesnt matter here, No gun in this example) So they are there as set items, Bones has somthing similar to this for his Titanic, he has 2 propellers.
I think thats what he means, Wrench a brick, Spawn a non moving solid shape, that say people can hide behind?