Fur, mine are against a fence so I have access to one side only. Mine are cement block, three blocks high, faced with wood. lengths are 14 to 16 feet outside, two feet er so inside. If I had both side access I'd go four feet wide.
I put big gravel in bottom and mix of topsoil, black Kow, potting soil in top 18" or so. I add soil every year also.
http://img.photobucket.com/albums/v166/DTala/garden/IMG_0880_zpslmjn4cjn.jpg


I've spent most of the money I've made in my lifetime on hunting and fishing. The rest I just wasted.....

proud Cracker-Americaan

muslims are like coyotes, only good one is a dead one