grow box how would u improve it

hello guys i am looking for some advise what do u think of this 2x2x3 250w hps scrog set up for 4 plants this is just for my stash and for experience for bigger and better things.and will the yeild be good.i have limited space.any advise would be greatly appreciated :confused:

http://www.overgrow.com/article/10/2

hay thanks chonged i went there and it had everything right down to the measurements and lights :)

:) hay huys what you think about this 2w 3L 4h 400whps scrog with 6 plants there will be vent and mylar will it work. :)