So i have been playing with the CAD again, and come up with casing 2.0
printed in red Z-Ultrat, but it looks almost like safety orange :P i have kept with my initial idea to keep the casing as small as possible
but of course the best bit of it all!! the 2 halves are screwed together now, rather than relying on pegs or clips or the like
i forgot how much i love a shiny stainless steel capscrew!!! i actually ran a tap into the plastic, which worked really well. The screws hold well, i have not tried to push it to the limits. but it is looking good!!