Like this h ?X w?x L?x dived by 1728 and play with some numbers in tell you get what you whant . Good luck //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
There are countless dimensions that will give you 6.8 cubes, you have to figure out which will work best for you though...by taking into account the dimensions you actually have to work with.