Correct me if I'm wrong, but that's a big pile of NURBS isn't it?
If so, I would seriously recommend using subdiv objects, they act like nurbs, but you can edit them like a polymesh... and you can make creases and such... much... much... easier... and with more precision. for instance you can make the mountains a little bit sharper, without making them look like cubes or whatever...
BTW, this is NOT me teling you how to do your business, it is only a suggestion... from one maya user, to another...
Are you in school for modeling or game design? (Like me XD; ) Either way I wish you the best of luck in all endevours... and hope for your ability to expediate your work so you have more time of your own... (college work suxz... but that's just my opinion)