Question: how many can i fit?

My indoor space im looking to grow is 2 1/2 feet wide & depth 7 feet tall. I was thinking 2 big ones. And I heard growing it out and up pulling the branches down help getting a bigger yeild, anyone have more info on this? This will be my first grow and here is the setup i gave up with, I used 100 pixels = 1 foot.

http://img211.imageshack.us/img211/1384/setupod7.png


Here is what i came up with. What do you guys think and any advice at all will be a ton of help. Do you think i can do 4 or should i stick to just 2 or maybe 1 MONSTER. Thanks for looking and help.

nice pic made me lol

Do 2 or 3, train them to do a scrog.

Ga Grown!