Try this question on the Vegetable Forum - it's much livelier. My initial thought is you are wanting to get too much into a small space but I garden in a different climate. http://forums2.gardenweb.com/forums/cornucop

If you want to "create" more room, try growing the tomatoes, squash and beans on trellises. If that's all one wide plot, rather than narrow beds, it's probably still too much for the space, since you also need space to walk and work between your rows.