As it is, I've made a handful of them and sold them to people on this thread that have expressed interest in the project. Partly to recoup development costs (developing hardware is quite an expensive hobby) and partly for a bit of testing and feedback.
Since the response has been so positive, both myself and flashjazzcat are thinking about a bigger run in the future. When we're ready, we'll properly announce the project and start an orders thread. I didn't see any point doing this before we are ready - the demand for the Ultimate Cart in the early days left me feeling under pressure to build an impossibly large number of them, and those that wanted one frustrated by the time it took me to produce them.
But at the moment, this is more of a beta for those interested rather than for "general sale" if that makes sense.