I went this morning and bought everything I think I'm going to need for construction of the boxes. I decided to build 2 4'x4' boxes. I was a little worried about the 6" depth so I will be using 2x8" untreated pine wood.
For the soil I will be using something close to the traditional Mel's Mix. I couldn't find five sources of compost so I will only be using cow and mushroom. I was able to find vermiculite at a local feed store, and I found baled peat moss at Lowes. I am also adding a couple cubic feet of Miracle Grow organic vegetable soil for good measure. I have used MG in the past for my peppers and have had good results.