marker pen driven over an 8x4 sheet help.

[Jonathan]

Minimum budget of around £800 - £1000 drivers etc but NOT PC or software then yes it's easily do-able.

This is only 2D or 2.5D so the free version of Cambam should be fine. I used it a lot.

but he's wrong(Sorry jonathan) about the resolution not being a problem with belts.! ... the low resolution becomes a problem with tight radius and medium to intricate detail work

I meant not a problem with belts for a plotter, but if you've done a plotter and it's wasn't then fair enough. There was a plotter at school we dismantled that was belt driven without further reduction...and the rapid prototyper, laser cutter.
Hmm, a cheap low power laser to burn the outline into the wood would be a snazzy way to do it! Might be easier than finding a pen that'll work consistently?
Given these parts seem to be for a 17' boat/canoe (?) I doubt there's going to be many tight radii or engraving! But still there's no point theorising unless we actually know, and it's clearly better to do it as well as you can afford to start with.