Spyder wrote: Thanks for the help. I'll get that cut deeper somehow, and make it work. Somehow. And I'm glad I'm not the first to have this problem, though I wouldn't wish it on anyone.
One of these days I'm going to make one where I don't mess it up as I go. Or am I dreaming again?
You certainly aren't the only one and I personally wouldn't even categorise this as "messing up". Encountering this situation myself taught me that machining the neck m+t joint to fit precisely in all dimensions requires complete control over final neck geometry long before the stage of final assembly. I get close, but not close enough to trust myself to machine the m+t to fit with absolutely zero clearance earlier in the build process. Snug fit is nice, and desirable but less important than with a glued joint since you're using bolts.
I've always had to at least slightly adjust the neck pitch or yaw during final assembly. This is not uncommon - you'll notice that almost every book that describes m+t neck joint construction includes a section on flossing or trimming the heel to get things lined up right. If your mortise is at precise depth, you cannot remove any material from the heel cheeks to correct neck alignment.
So you have not made a mistake, you are simply engaging in a time-honoured tradition of the craft 
I opt instead to simply make the mortise slightly oversize in this dimension from the get-go. This means there is always a slight gap between the end of the tenon and the bottom of the mortise This is not a problem since it is the 'cheeks' of the heel which bear the load when the bolts are tightened.
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