Both ideas would keep all the wiring in the top compartment very minimal to leave room for showing off the tubing. The pump would be located in the bottom compartment along with a fan controller if I can find one that fits. per CaseLabs, there is only about 140mm ish from the top of the mobo to the top of the case. I don't want to fill up the whole thing as then you couldn't see much thru the windows. So . . .
In the "clean" look, I would go with something like the XSPC EX240 low profile. It comes in at about 35.5 mm deep. Along with the Cougar fans I'll be using at 25 mm, that leaves me with about 80-85 mm of space left for tubing and viewing of the board. I could get a micro res and put it in the lower compartment, or get like a 40mm-50mm cylinder res and mount it in the upper compartment - probably on one of the 120 front fans.
In the "wild" look, I'm eyeballing the Coolgate copper res which I love the look of! Especially when paired with the Cougar fans. For a res for this look, I'd probably go with one of the primochill phase 2 amber cylinders, or maybe spring for a frozenq cylinder res - the last one I used from them has lasted me over 4 years without an issue.
I can run this one of two ways - mount the radiator on top of the mounting bracket, meaning cutting a large whole in the case skin, fans on the underside of the bracket (inside the case) and then a res on top of the rad. This is pretty aggressive, but you'd be able to see the sides and top fins of the res, as well as the reservoir on top. Could be interesting.
The other option is to mount the rad and fans on the mount inside the case, and then mount the res on top of the bracket. You wouldn't see the top fins of the rad, and the copper sides would be down inside the case. The res would still be poking up out of the top, but it wouldn't be as drastic. I'd then look to have tubing come in and out of the case in a few spots for a unique look.
For both looks, I'll be doing regular "soft" tubing as I already have a ton of black compression fittings. I'd considered doing a hard acrylic tubing, but I do have a budget and didn't want to spend a chunk of it on new fittings when I have plenty of the compression ones already.
I'm sorry if it's hard to visualize, but those are the two main ideas so far. I haven't ordered a new res or rad yet until I figure out which way I want to jump.