external case coolers

So I’ve been toying around with an idea/design for a simple 240mm external radiator. The goal would be an anodized black matte aluminum case, custom integrated acrylic reservoir block, ddc pump, 240mm slim radiator, room for 2 25mm 120mm fans. Why so small? Well I’m hoping to have something...

Sorry for making so many new threads. Anyhow, I'm thinking about how to make the best possible cooling solution, either 100% or 90% passive. It seems maximum surface area of heatsink is the bottleneck (heatpipes are uber-effective at moving heat away from the CPU, so the only issue is...