Would this help?

[juanhbk1]

I think that with MC edit you would be able to do this rather quickly. It's not as though you need to do every single block, just a giant area in a place you don't need all the way down to the void.

oPeN gL pLs

Seriously though, we've already discussed this, if you use OpenGl, then you won't have a problem with rendering blocks you can't see.