Well I ont have plans but I just made myself a feild box a couple of weeks ago and it turned out great. I figured I would post some pictures just to give you a general idea of what to do. I just cut and glued together some scrap plywood and used a closet hangar bar (huh?) as a handle, then a little spray paint and viola im done. keep in mind I am ony 13 and did this without any help =D.

Good luck,
Tyler