My wife wanted a PC she didn't have to maintain and she didn't want to spill something on it. So i build a dual system PC under my desk where it can be taken care of with remote connections for her peripherals. here are the current specs:
Common Hardware: Phanteks Enthoo Mini XL DS, Corsair 6x HD 120/140 RGB fans and 4x lighting strips, NZXT Sentry 3 fan controller, Cable mods cable extensions, and Omron relays.
System 1 bottom: i7-8086k (WARNING do not use MCE it forces 1.5v into your cpu unless you upgrade to BIOS F7), Gigabyte Z370M D3H, 16gb Gigabyte RGB 3200Mhz DDR4 memory, Samsung 970 pro 512gb NVME ssd with EKWB NVME heatsink, Samsung 960 evo 1Tb NVME ssd with EKWB NVME heatsink, EVGA GTX1070 FTW2, Fractal design S36 AIO, Gigabyte GC-WB867D-I WiFi card, and Corsair lighting hub.
System 2 top: i7-8700k, Gigabyte Z370N WiFi, 16gb Gskill Trident Z RGB 3200Mhz DDR4 memory, Samsung 970 pro 512gb NVME ssd, MSI GTX970 ME, 2x Western Digital black 2TB hard drives in raid 1, and Fractal design S24 AIO.
The case came with a power supply device that powers 2 motherboards with one power supply. I used cable mods extensions to supply power to all the components because the case does not come with any. The case came with a 5.25" drive bay power/reset/connector for the additional motherboard, i did not use this and instead used a Silverstone ES02-USB remote PC starter and usb extensions from the rear of the case. I also wired in a green halo power button for the top pc's use when the wireless starter fails. I use the NZXT Sentry 3 to control all the case fans independently and then use the Fractal design S24 for the top MB and the Fractal design S36 for the bottom MB. That way the cooling does not change depending on which MB is turned on or off due to fractal design AIO's pumps being powered off the CPU fan header.
Problems i ran into: I had to cut the removable motherboard tray out to fit the 140MM fans for the H115i radiator i originally had in the top (this is a design flaw in this case they could easily fix with a tray revision). I swapped out my RM650i with a Corsair HX1200i because i ran out of CPU and 8 pin PCI-E power connectors (also future proofing). I had to remove the Corsair H115i in favor of a Fractal design S36 because SATA power keeps the pump/fans/lighting running when the power supply is on (no matter which motherboard is on) so i have had to install a complicated relay system to prevent this and other sata devices from being powered up constantly. I had to remove the corsair commander pro because it kept messing up my lighting/etc when sata power was on but system was off (rerouted thru the lighting hub).
Plans for the future: Replace the MSI GTX970 ME with my GTX1070 and replace the GTX1070 with GTX1080 TI+. Replace the side panel with tempered glass. Install an LCD for status monitoring.
The system builder here wont allow you to configure dual system builds correctly (adding additional MB, Ram, Processors, etc so i added them in as custom parts).