I am considering a lathe setup specifically related to cutting cylinders, like a banjo lathe. This would likely involve two X and two Y planes, similar to what is shown below. The exterior cuts are straightforward enough and could be accomplished with a variety of set ups. My primary concern is the interior cuts. Ideally the reach of this lathe would be in the range of 16 inches on the X axis. The first picture below shows a shallow cylinder, perhaps only 4 inches. I would like to cut up to 16 inches deep. Would it be possible to use a 16 inch boring bar attached to the gantry plate? Alternatively, how would I get this sort of reach using Open Builds components. Can a C Beam be oriented upside down, such that the gantry plates are fixed and the beam moves? Thanks in advance for all advice.