Currently rocking the bykski DDC pump top, but it takes away pretty much space in the GPU side.
I'd be very interested in an option with a little res (like you mentioned out of stainless for instance).
This concept looks really good, can't wait to build a loop around it in my T1.
I think this type of block really could use a Reservoir built in to make it easier for people. That's the game changer on the Barrow block. The trick is that both POM and Acrylic is too weak to allow the thin walls necessary for the 48mm height limit. I'm thinking maybe just making the whole thing out stainless or copper to integrate reservoir.