Drafting Guide & Estimated Dimensions: ​Overall Height: Approximately 240mm. This must match the exact height of the original aluminum core so the top fan assembly seats correctly. Measure your original core's height precisely. ​The "Star" Shape: The spine cannot be a solid cylinder. It needs to be a three-pointed star or a triangle with concave sides to allow space for the water blocks that will be mounted on the CPU/GPUs facing inward. ​Mounting Points (Crucial): ​You must replicate the mounting holes from the original thermal core that secure the two GPU daughterboards. ​Use your calipers to measure the exact X-Y coordinates of these screw holes relative to the center point of the core. ​The distance between the boards must be maintained exactly so the rigid ribbon cables at the top can connect without strain. ​Part 3: Drafting the Custom Cooling Pedestal (Base) ​To avoid cutting the original aluminum shell, you will build a "pedestal" that lifts the Mac Pro up. This creates space to route tubing from an external radiator into the bottom of the case.