The JGRO plans are pretty straight forward. There are a couple of places where you need to improvise a little, but as has been pointed out, there are a number of pictures around here showing what people have done. And if you get stuck, you can always ask for close-ups of different places.
I only recently finished my machine...okay, it isn't done yet. I need to put the rest of the lead screw bearings in (they were....delayed).
You will probably find plenty of folks happy to answer any questions you may run up against.
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Working on my first machine