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0o0 - I arranged the tubes in that way because I plan on leaving a coil of excess wire and tubing inside the case to allow me to slide out the motherboard without disconnect. However it's not final and I am considering a number of options for revision2.0.
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dustin - Thanks for the comments mate. The fastening will work something like this
LINK. If I use titanium it will be all laser cut - the MSRP on the titanium I would need is about $28,000USD. I found a source for about 10% of that, but I'm not certain just yet if it's the way to go. If I do use aluminum it will be plated with something exotic (tungsten carbide would be nice, but not sure if it's possible) or hard-anodized aluminum with some kind of funky rubberizing perhaps.
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Deamonsblood - Thank you, but as for cost... these are questions best left unanswered.