OO.o support for OS X isn't too great. You could try this: http://www.neooffice.org/ however it is not free until August 29th.

Compiling OO.o doesn't take 2GB of RAM. I've done it with 512MB or less. It does take a lot of disk space. It also takes many hours and there's a good chance of failure. You'd need gcc and I think some versions of OO.o require a java environment for som reason.

You could try a Knoppix disk and run OO.o from there. However I'm unsure if there are any Knoppix disks that will work on a Mac Intel.