I purchased an herb raised garden very reasonable and assembled it my self and I am a 72 year old female. It is 6 ft. Long and 2 ft. Wide. And 12 in. high. I went on line and searched raised garden beds.
It doesn't have to be 4X8 as long as you have the 32 square feet. My husband built mine in an "L" shade that fit the room. It is 2ft wide in some places and 3ft wide in others and long. It has made it easy to clean as I can reach all the areas. Once summer with warm weather arrives My Russian will be headed in his outdoor enclosure.