It's a little odd seeing the map without some of the major bosses/baddies in there (Mother Brain's area specifically), but this is indeed cool as everyone else has said.
I've noticed a mistake. A room in Crateria that is above the old Tourian excape shaft, you have to have bombs to get past some blocks. It's the room that is outside of the room with a chozo statue where you get a missile upgrade. The one with the hidden tunnel with the 4 1x1 bomb blocks. The map shows the hidden tunnel going straight through, when actually it stops over some crumble blocks.
Best. Idea. Ever.
Edit: Looks like it's sorta based on this. I mean, the 2nd post in that thread. :-p
Yeah, the map's not perfect. There are places that don't quite line up properly, a number of places where interactive block types are not displayed, and even some places where the basic tiles aren't displayed properly (such as in the gauntlet entry). Regardless, it's still a very good map.