With all due respect to your business vision Gabe, IMHO, if the product does take off (and I really don't see a reason why it shouldn't... it is a really good idea) providing pre-cut tubing might not be the best option.
As you already provide with those stubby fittings (which do have a cost attached to them), and you've already said that you are not properly tooled to do so (which means, atm is a blank canvas), and considering that tubing is a perishable item, it might be worth looking into making something like the BitsPower D-Plugs.
I'm sure a designs that fits both 25 and 37 mm fan spacing is possible (Koolance does it with the RAM fittings, so does BitsPower with the D-Plugs, using a slightly different solution), it's a permanent fixture (only the O-Rings are perishable, and those are really easy/cheap to source), and a much more elegant solution.
And saves you the headache of researching the automated tube cutting tool and the investment on such contraption.
As I said, just a suggestion. There might be hidden obstacles that I fail to see.
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