So... how much spare room is in the default motion system. I would like a build volume of 300x300x300 --- but looking at the default provided motion system --- it's just so pretty. Is there extra room as long as the tools are a certain size? Can someone point me to where we can get somewhat longer versions of those rails? where does one order aluminum cut to a spec? So many questions. I suppose the first of which ... is there a little extra room in the stock design, and if so, how much?