This is a project I have started, and I am first conceptualizing. I'm looking for a decently priced truck on ebay that I can buy and model. I have been all over the net, and have not seen anyone atempt this type of linear way. I don't know if I'll do the caged ball design, but will definetly figure out what's involved. I have an IH CNC mill, but I want something with linear ways that I won't have to worry about doing really small stepovers on molds and wearing the ways away. I'm still working out whether it's cheaper to find some on ebay, or to build them. I would probably still buy the rails, seeing how those are hardened and ground. I just can't wait around forever for a good deal to pop up on ebay. Plus, I have to compete with all you guys when they do! So I thought this would be an intersting project. I'll post some DXF's later of what I have, and then any input or advice would be much appreciated. I'm going to go for the style where two rows of balls are on the top and perpindicular to the rail, and then two on the side which would be perpindicular to the rail also. I will get into my ideas about how to build them in a later post.