I figured I would try to help out the people who were like I was back in the day.
I will do them for free, one one condition. You have to do my free ipod link It is basically like exchanging my time for your time.
I will include all the dimensions, wood cut sheet, and assembly instructions for a custom box of your dimensions.
Basically, you can get it for free, just do what I did, sign up for the ancestry.com thing and call them to cancel the next hour/day/week.
Look in my sig for details.
Edit: *You must complete one of the offers in order to get box plans.