Ok. Here is a list of supported hardware for the Circle Pro barebones case.
Motherboard
Any standard Mini-ITX board.
Water Cooling AIO
275mm x 120mm x 30mm
Note, these dimensions aren't final and are still being tested. The radiator is quite close to the GPU ATX connector, and the thicker the radiator, the more tightly the cables from this connector have to be compressed. Thinner radiators are preferred. We have been testing with a TD-02 Lite which is 27mm thick. I think an additional 3mm will be fine as it has been designed with clearance in mind - but I'll need to test it to make sure.
Also note that the cooling block section either needs to have very soft tubes coming out of it (ie. Fractal Celsius S24), or angle adjustable tubes (I.e. Silverstone TD-02 Lite, Kelvin S24), so they can be pulled to the side and zip tied to the core - otherwise they will collide with the glass panel and prevent the case from closing. The side panels are held in place with magnets, so any internal force against them will mean they won’t sit flush.
CPU Air Cooling
The whole point of this case is to support liquid cooling, so it hasn't really been designed with air cooling in mind. If anyone's curious about using the AIO space for something else and using CPU air cooling, I will calculate the dimensions for you here.
RAM
Depending on the location of your RAM, you should get as low profile RAM as possible. In some cases, you may have to route the water cooling tubes over it, and if it’s too high, the side panel might not sit flush.
GPU
Any ‘mini’ class card up to a length of 212mm (Zotac 1070, 1080 and 1080ti mini cards are all supported). Note that we haven’t yet tested the ‘overheight’ Gigabyte 1070 mini card. It might fit depending on the thickness of the radiator you’re using.
PSU
Format: SFX. Corsair SF450 or SF600 highly recommended as they are silent until high load. The Silverstone units are quite noisy unfortunately.
Drive support
Number of M.2 SSD drives supported depends on your motherboard. Up to 3 x SATA 2.5” drives supported (only up to a thickness of 9.5mm, the case doesn’t support the thicker 12.5mm drives).
Fans
Cooling and noise is an important aspect of this case, so we’ll be supplying the 4 necessary Noctua fans in the price of the case. We don’t recommend using the fans that come with most AIO radiators, as they are far too noisy. We are supplying 2 x Noctua NF-A12x15 PWM (chassis fans) and 2 x Noctua NF-P12 PWM (radiator static pressure). You will also need fan extender cables, which we will supply.
Dust filters
These come as standard and should be mounted against the supplied NF-A12x15 fans at the bottom of the case.
Other bits and pieces
We’ll be including a custom internal IEC passthrough cable and region specific IEC socket connector. A custom SATA loom. Custom SATA dock. Shielded PCIE riser. Fan extender cables. Custom Power button assembly.
Price TBA.
I’ll update this list as more information becomes available.