Ah I had that alot. I got sad after I realized I didn't have the right parts.

I think we should make some sort of Guild of MOCists, and force Lego to endorse MOCing by lending parts.

This is me exactly. I want to build an airship too!

Actually right now I'm modding the Clone Wars pirate tank set into some kind of Terra-ship. I think it'd be an interesting idea.