The title says it all, my neighbor just gave me about 30 1x4 #2 pine boards around 34 inches long and says he has a steady supply coming in from his job. It couldn't of happened at a better time since most of my deeps are starting to show their age. From some quick measurements I will be able to get the width needed for a deep by edge gluing two 3 1/2 inch pieces and add a third ripped down 2 5/8 inch piece for the total width needed. I'll probably add some vertical scabs for extra strength but considering the cost of boxes these days making my own from free lumber is a no brainer. Can't think of any downside of using 1x4's for deeps as long as the glue joints are tight. Can't cut box joints for the corners but using long, short, long boards for the sides and short, long, short boards for the ends will help a bit for strength.