It's still a work in progress, nothing is fixed at this point. It's a case of where do you stop to keep the theme of the concept intact and at the same time try and satisfy a good range of buyer build options.
I've had lengthy chats with [USER=267]@K888D[/USER] about potential coolers for the case, a Dark Rock TF without the top fan is 105mm.
In an attempt to keep the design as minimal as possible and where he was at with dimensions for protoype 1, supporting "Up to" the Dark Rock TF at 105mm was a sensible choice. It also opened up better ram (and pump) options for AIO builds.
I do believe if you want air cooling for the case C-Type (i.e top down) is the way to go, I also think you want something close the side panel to minimise recirculation. 90mm+ heights will be the ball park to shoot for.
As shown the NH-L12S with a 25mm top fan (95mm total) is showing good results already. And with the bottom fan removed still gives you good options for various ram heights and in your situation with the TB3 it will clear that chipset heatsink.
As soon as Covid subsides, I'll supply [USER=267]@K888D[/USER] with some hardware that he doesn't have right now to test some builds out 
