I'm not ready to build yet, but have been doing lots of looking around and contemplating. I rejected the CNCRouterParts plans for many reasons, not least of which they are based on the Imperial profiles. It isn't just a matter of the cut lengths. If you look carefully, for example, the spacing of the mounting holes on the carriages are imperial to fit the 8020. If you were to buy the carriages ready made (from them) then they wouldn't fit metric profiles. And these 6 skate carriages don't look that easy to make without metal machinery, which I haven't got. The four skate carriages on angle look a lot easier to make, but being at 45 deg are not as easy to mount. I just wish I could find a simple way of mounting supported round rail onto aluminium profile - any takers on that one?