I have this crazy idea to watercool the Velka 3:
Bear with me -- you get a 2x80mm rad (Alphacool makes one), you get the Eisbear LT waterblock/pump (only 39mm in height), you power the case with a G-Unique 450W so you have the basement empty. You flip the case upside down and mount 2 NF-A8 80mm fans in exhaust on the bottom (now top), you mount the radiator externally on top and you route the tubes through the the PSU hole -- you could even drill 2 holes with a stepdrill through the HDPlex plate, so it looks nicer. Voila, you can cool a 3950X or 9900K, even X299. It'll add about 0.5L of volume (not counting the external brick). You can use some low profile plastic grills to protect the fins.
I guess at that point you're 1L short of the Velka 5, which fits a full GPU, SFX PSU and you can (mostly) cool a 9900K or 3900X/3950X with a C7 Cu + A4x14, so I don't know if it makes sense, but it would sure be a really cool build. I wanna try it, just not sure it's going to be in the budget this year... But I extend the challenge to someone who has the resources/parts to try (OptimumTech?)