Colin, looks great, good to hear the project is moving forward! Feel free to call if I can be of any help. I generally do all the AC wiring first, since I want that near the chassis. Then I do the power supply and output stage. Once heaters are wired I check to make sure everything lights up correctly. Once the output stage is wired you can kind of get an idea if your PS is going to be okay. While the input current draw will lower B+ a bit once it's done, the output should be in the ball park. Oh, of course, be very careful with cap discharge after you test stuff. Be sure it is fused correctly too. I don't know what kind of wire you'll use, but a lot of it these days is only rated for 300v. Grounding is always the biggest issue. Again, call if I can be of any help.