Hey guys... decided to build a CNC and using Sketchup to design it. I'm trying to use as much as possible from the premade objects from OpenBuilds, that way I know the parts are accurate and exist. What I can't find though are the rails. SBR20 I guess they're called? I'm looking at this guy's machine because it's the size I want and I'll be designing guitars as well. Overall I need a bed that's close to 24"x36" in order to fit guitar bodies, and long enough for bass guitar necks. I assumed at first he was using 2040 extrusions, but when I download rails in Sketchup they're always way taller than the rails, so, maybe using 4080? which I don't think the site has or has any premade objects for. Anyone know what size/name rails go with 2040? or, looking at the video, is he using something else? Also... T-slot and V-Slot... they the same thing? I googled and I don't see the difference. Thanks.