question on which way to set up box

Need help on which way to set up the box i got, which is pretty small. I want to get as much as possible of course. With the box upright its only about 20inches high and 1.5x3.5ft, its an old toy box. So i figure i can grow like maybe 4 plants but i'll have to save as much height as i can, by using the smallest pots possible for the plant and putting lights on the side, etc. Or i got a good advice of putting the box sideways so its about 3.5ft hight but that will only leave room to grow like one or two plants. I also wanted to make sure that with about 14 weeks to grow the plants will have enough time to grow to this height which i think they will. When i get home i can get pictures of the box. Please help.