This is truly an epic build. I am envious of how it is turning out.
I have a few questions.
1. You said that you would need more fittings than what you currently have to make the connection from the GPU and the CPU. Perhaps with a 45° fittings at the GPU could aline the fitting so a single 90° copper pipe may go from the CPU to the GPU.
2. What type of copper tubing did you use? K, L, or M?
3. What method did you use to bend the copper pipe?