As print readers of the Woodworker’s Journal know, we design a good number of the projects that are featured in our pages. And that is especially true of our shop projects. For example, in the April 2012 issue of the Woodworker’s Journal (on newsstands soon), we present a downdraft sanding cart. If I must say so myself, it is a very nice and truly functional project. How do I know that? Well, because I’ve tried it, of course. But, you might ask, how did we know it would work properly before we built it? Good question. How can we be sure our projects, specifically ones like this, whose primary feature must be functionality, are all we want them to be? It is a short answer, really: we build prototypes. We test out the ideas that we have with knocked-together mock-ups made from MDF, plywood or whatever we have lying around the shop.