I planted some radishes on the back half of the top of the bucket (I'm told they grow really fast). So far I have Lettuce, Swiss Chard, and one Radish that have sprouted. I added a plastic grocery sack over the bucket and the seed pods, I think this helped to maintain temperature over night (since the bucket is next to a window). As a result the seeds are doing better. I spray the pods and the top of the bucket each day with a water bottle to keep them moist but not soaked.
I highly recommend this book. Mel was an engineer by trade and failed miserably with his first garden, so he decided to use his engineering skills to simplify gardening and make it more efficient. Chapter 1 goes over all the wasted materials and space that most "single row" gardens have and how he figured out how to cut them out of squarefoot gardening to make it simple and streamlined.
I will probably build two of these squarefoot garden boxes in my back yard this year after the snow melts. I am also considering a green house for growing lettuce and spinach next winter.