Hi Everyone, this is a pretty amazing community, I can't wait to get started on my machine. I have wanted a CNC Router every since I saw the first DIY MDF machines years ago and after learning about open builds I think I am in a position to build what I want. I am looking to build a 1500mmx1500mm machine that utilizes as many off the shelf parts as possible. Because my interest is in larger projects such as furniture and speaker cabinets eventually I would like to be able to load full 4x8 sheets of plywood so I am trying to design something that can be built upon or partially recycled as I gain a better understanding. My plan is to use C beam for the X, Y and Z rails with the X axis being driven by CNC Router parts R&P gears and drives and the Y axis being driven by a 1/2 5 start Acme screw and the Z by 3/8 or 8mm Acme. I was hoping that someone familiar with openbuilds hardware would look over what I am planning and let me know if I have made any obvious mistakes and how rigid it appears before I order enough of the parts to partially mock up the machine to better design the R&P X drives and the Acme Y. Below are a few shots from Sketchup, note they do not show a bed which will be a torsion box entirely below the X rails so I can keep the Risers as short as possible and keep most of the cutting area around the center line of the x carriage (is this a good idea it seems like it would limit the effect of deflection from the x axis).