Ummmmm ... identical string spacing to the 35" scale Warmoth Gecko neck. But then you knew that cuz you'd done all the research and calculations.
It's clear that you investigated the string spacing detail ... but research into building a quality, playable instrument involves a whole lot more than just checking out one or two small details. Here's something to ponder: I currently have 16 templates just to make a double-cut bolt-on 5-string bass. There was a TON of research that went into their design and creation, research that left me making CAD and template models detailed down to .005", research that lead me to utilize certain types of template materials, research that lead me to utilize certain templates for a single operation and others for multiple operations, and research that lead me to utilize specific tooling to perform specific tasks.
So how far have you gotten in reading Hiscock's book? I'll give you a little tip: read it about 10 times, get out to the shop and make a little sawdust in the process of making a body, and then go back a read the book twice more.
A load of the advice that experienced builders/luthiers have been sharing with you - those parts about research in bass building, woods, construction techniques, and tool usage - will suddenly glare at you, and you'll come to a personal conclusion about a lot of things about the time you're finishing your first bass you've constructed from scratch. It hasn't been so long since I was 20 that I don't clearly remember trudging the same path you're walking now...
All the best,
R
"Evidence that a man is wise is not judged by what he knows, but instead by what he knows he doesn't know."