I've been waiting so long to start a portal case mod. This case, it just speaks to me. Just gonna jot down the thoughts.
Couple variants as far as the liquid cooling goes:
-420 and a 280(240 if needed to clear power cables) radiators. Dual loops, double bay split reservoir,2 pumps, orange(cpu)+ blue(gpu) coolant. Transparent tubing.
-A single 420 rad. Bay res. Single loop(cpu+gpu). Solid(color) orange and blue tubing, orange in, blue out, switching at cpu and res.
-A single 420 rad. Bay res. Single loop(cpu+gpu). Transparent tubing, white coolant.
Modify the side window, cut out a rectangle shape, replace with one way glass or acrylic with proper in case lighting to get a laboratory testing look similar to observation windows in portal. Paint the aperture spiral logo on bottom front plate. Print or paint a companion cube mural on back side panel.
Wishful thinking.