There has been a trend in the neighborhood towards planter boxes. I don't fully understand why vegetables can't just be grown in the ground like they did when we were kids, but I'm not about to buck this trend. Modern vegetables require way more care and attention than the rough and tough vegetables of yesteryear.
The vegibox as built has final outer dimensions of: Length=72", Width=21 3/4", Height=11 3/4
The frame brings the top of the box to 31" off the ground. After installation on concrete pavers, the top height will be about 32" high which is about normal kitchen counter height. Bringing the planter up to waste height is a definite back saver as you can tend your veggie garden standing upright.
The vegibox consists of a cedar box supported by an indestructable 2x4 pine frame that will most likely be capable of supporting 2 to 3 times the load it will ever see. Definitely overkill on the frame. The box can be separated from the frame. The weight of soil and water will clamp the box to the frame - a gravity clamp. Cedar has good outdoor rot resistance which makes it a good choice for planter boxes. It is also untreated which means that toxins won't leach out of the cedar box into the vegetables. I chose untreated pine for the base because it is strong ( people build houses from 2x4's ) and with a coating of deck stain, will hopefully last a number of years in the outdoors. I prefer to avoid treated lumber even though they stopped using arsenic ( or more accurately chromated copper arsenate) some time back.
Enough rambling - time to start building. With apologies to John Brown who I'm sure spent the day keeping the TV safe.