Thanks for the replys guys
I have to admit that I haven't even got my X-1 yet, but I am planning to CNC it from the off. I guess I would need an end/slot-mill with a 120mm long shaft to cut this hole out without a boring head - and it seems I would run out of Z-axis with such a long mill
I think a boring head on its own would work, but it'd need about 200 passes to get from 10mm to 70mm dia, with a manual adjustment of the cutter after each pass - which kinda defeats the object of CNCing it in the first place!
I guess I may have to go back to the drawing board on this part...
EDITED due to lack of coffee before posting
