I've got a couple small workbenches (from a previous project) for misc stuff, but I'm about to build a single large workbench intended for the 9A, and I've got this question - some builders have included a back-rivet plate sunk into the surface somewhere, some guys talk about finishing their entire airplane using nothing more than a door on some sawhorses for a workbench. I intend to build a nice sturdy full-blown workbench, about 3'x10', but what about the back riveting plate sunk into the surface? Is this just a "nice-to-have" for once in a while, or is it one of those "just do it, stupid!" kind of things? It will never be easier than it is right now to install it, but there's not much point if it will only be used a couple times - unless it's one of those situations where nothing else will work.