You can have great success growing in that amount of space, I just finished up a grow and with tying the plants down and bending them over I was able to get 2 med-large plants into a space about that size. I have found tying and bending to be very benifical in the overall outcome of the plant.

Let me know if you want any more info on bending and tying, I feel it is a great method to utilize when you want to contol height. I personally feel it seems to increase basic yeild of a plant as well. (However that is just a personal felling at this point, I need to get a few more grows under my belt before I would make a general statement that it actuall does increase yeild)

Good luck!

JRF