I think you did a good job of making a ok 3player map. There are still some things you might want to change, that's why I wonder why you called it "final"

Ow, nice 3 plyer map. I'd do some minor changes to it, but it looks good as it is now.

First: Only the player at 6 is able to cover his choke with a Zerg hatchery, the others aren't.
Second: The wall behind the min-only on the right hand side is good for Terran to place the Tanks behind it, but the other min-only positions don't have that wall.

Well, think that's everything i'd mention :)

I think it's nice too, but you should consider those minor balance flaws before posting it as final..

I came accross this map randomly.
Great balance for a 3p map.
Those wide bridges, are they custom doodads?