Well 4 p maps are hard to make but i got the skeleton of one finished =D
Suggestions PLZ!!
Here it is:
[attach=7395]

Attachments:

Mineral blocks on the islands. Always put mineral blocks on island expos.

Also, I'm not sure about this, but maybe siege tanks can hit the third expos from the mains. Again, not sure about it.

well because this is just a skeleton right now I do not want to place something that dosent have to be placed untill end because i might be moving it around

It's cool, but a bit bland in the middle..

I think it'd be alright if you shrinked the middle big bland part, and put the bases a bit closer together, but without the base being able to tank the third expo.
Then, you can make the island expos a bit bigger.

Conceptually, it's nothing special.. looks cool tho.

I think this picture will help alot with suggestions