I'd already spotted zapp had long enough stock ;)

Yes this is my first cnc machine build so inexperienced form that point of view, not in engineering, electonics or CAD though.

What we need is similar (although on a smaller scale) to what is pictured bellow.

Click image for larger version. 

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As you can see there needs to be a larger distance under the gantry to a normal board type router, which of course increases the leverage force from the tool to the gantry.

As quite rightly said, I don't want to over engineer it for no gain.