So, I talked to Rab, who built one of these a couple years back. He went with Swamp Ash for the body, which is the body wood I planned to use, and he got his routed for a trem. His neck was canary with an ebony board, 25.5" scale. He said it was nicely balanced with no neck dive.
I'm planning on getting a hardtail, so my body should be marginally heavier than his. As for my neck, I'm not 100% sure what I want, but I may go the simple route of maple / rosewood with MOP dots. Would Rab's canary / ebony combo be noticeably heavier / lighter than my maple / rosewood combo? Still, I'm led to believe if he has no balance issues with the trem route, I likely won't have them without it.