Ah, engineering school is making me pedantic. For engineering purposes, there is a clear distinction between mass and weight that is enforced under penalty of shunning. Because the last time we didn't, space ships blew up. And that's not okay.
That being said, I'd rather cut off my dick than use the imperial unit for mass. It's truly Satan's unit.
Technical explanation because I'm in a babbling mood:
A force is an amount you can accelerate a given mass; a mass is a property of a collection of atoms based on how it accelerates from a force. They're immediately related (weights are just forces with an implied acceleration of Earth's gravity), but different. Equations break if you don't distinguish them. Houses fall down. Cats and dogs, living together, mass hysteria!
So we gotta distinguish that shit. And I guess cubic kilometers is better than kiloliters for solids under grounds that liters do usually refer to fluids (liquids and gases-type fluids), but by definition they're the same thing so that's mostly a nicety.
Yes yes, more cats, hats, and miniatures. In fact, do me a favor and rob GW of some stock and send it overseas for a reasonable price so I can afford Termies.