to the op. i am not against anyone building their own box. have at it, i encourage it. if you want to build a hot rod, a kit car or a jacked up truck, no problem there either. i was just pointing out that building a box without having some skill, the proper equipment or the ability to farm some work out would be very difficult for most people. you need something a little more than a hammer and a few blocks of wood and some scrapped out appliances. a montezuma style slant front box would actually be one of the easier types to make. making a 30 inch cabinet with a stack of drawers is obviously tougher and a double or triple bay is far above that.
your question on garages? i am not really sure how to take that. everyone has their reasons for what they have and what they do. some guys have shops to collect shiny things. some shops are for repair and some are for fabbing and building. they may be a combination of the above or 100 other things. everyone knows the saying about good, fast and cheap, pick two. the same can be said about shop projects whether it be building cars or tool boxes. either project takes, skill, equipment and money. shorting any of them will more than likely leave you with a substandard end result.