Either way this is brilliant work and really happy to see a case like this.
I really enjoy "cramming" the best watercooling setup into the smallest amount of space, maintaining great temps whilst looking nice at the same time.
On one side of the scale you have a Nano S with fans on the outside, where as the S700 is nearly the same size, volume wise, but looks 10x better. I really love the minimalist look.
If it's any inspiration/motivation, I would pay a significant amount for this case - a well built, well thought out solution to having at least 480mm of radiator space in a case smaller than, or around 20L would be worth 250-350$ for me, in terms of pricing. (I know that would be higher if this were manufactured in a smaller amount - and to be fair, the cost of doing something like this through protocase for a one of prototype, which is what I'd be looking to do for myself would be easily 500+$.)
I completely envy anyone who has the experience to be able to design cases in CAD - I don't have the time nor patience to put my ideas down into a 3D model. So you are doing great work, even if you feel like you don't have enough spare time - you are doing more than I ever will!