I have the set up you were originally thinking of, swamp ash body, maple neck, ebony finger board. I have a Wilkinson trem on it. I put a Nailbomb/2xTrilogy set in it. I really like the sound it gives, but I was looking for a 'power strat'.
If you are having it custom made, you could do what I did in my PRS EG (alder/maple/rosewwod), and that is a Crawler in the bridge and 2 P-91's. It sounds awesome. I love the sound from the P-91's. They also work well with one coil from the Crawler. Tim had the scratchplate made for me, because most of my tools were in the US and I was living in London.
It was on the BKP stand at LGS and I know a few people played it and liked the sound. I'm actually going to put up some clips of it tomorrow sometime.