Nick, a thousand apologies mate for re-naming you, I'm just crap at remembering names, I just can't think why this Neil popped into my head?

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I came to the final size of the main cockpit tube as being 5 1/2" as really, it fitted in with all my other dims. Doing a rough placing of kit parts on the un-cut tube & on paper, all seemed good to the eye for me.
NOTE: Please do not take as absolute gospel my dimensions & findings. I'm only going with what I find to be correct & am happy with.
Right, here's the start of the cockpit then. Starting with marking out all the relevant dims of the tube on paper with a 60 degree cut the dims come out as:
172mm long side
95mm short side
132mm middle point
160mm eliptical cut
Had to bring in my tech-drawing days to get the eliptical shape for making the templates to cut the tube. After marking out all the points a rough saw cut was done & finished with sanding on a flat surface, came out perfect

Next step is marking out the plating & the holes that are visible under the Koolshade.
Back to work then.
Stu