Good luck, John. I'm one of those that built an MDF machine, although I used steel pipe and skate bearings as guides. I used that machine for the best part of 5 years, but this afternoon I'm screwing the bed down on my mk2, welded steel and Hiwin rails. I think that there is a difference in approach between Europe and North America here, from basic design to choice of electronics. Diversity rules! I look forward to seeing your design as it develops.