just want to say that i am following closely on this as i am thinking of doing the same retro in the coming years on a mill turn like the intergrex. very interesting. i have 7 big cnc machines all 5ton plus machines running in my machine shop and love it. pretty keen to get into mill turn at some stage but don't really want to use the old controllers. they keep dying and i seem to have so much more machine once its got linuxcnc on it. but a mill turn is a big job!
if you want to swap notes on messenger or something hit me up probably best from my website beckcnc.co.nz.