Aww James this is shaping up to be one sexy build.
Question about your loop config (which looks fantastic by the way). Why* did you opt to bend tubes rather than use fittings, was it for aesthetics, or was it too hard to work with fittings?
Also, why favor the 45s over the 90s? Is the space too* little to bend 90s without kinking the tube?
Can't wait till it's finished!
Edit: Ooh and the dye. Is this Aurora 2 supposed to be for display purposes as the previous aurora...