I don't know how much detail everyone wants to know about building a completely unique guitar mostly from scratch, but when I began to make the templates and was a little concerned with the odd extra wide heel shape on this, I scratched my noodle and farted out a plan that I have to admit I am very proud of...
I started with scrap MDF and I drew a center line on it.
Then I drew a perpendicular line to it.
I mounted a piece of scrap pine (which around my garage is proving to be VERY worth the $1.60 per 8 feet) on the edge of that line.
Now, this is only going to work if I'm right in assuming the two protrusions on the back of this heel are identical in shape and size. If one is shorter than the other (I'm 99% certain it's not) then my centerline will be inaccurate and the neck will be mounted crooked (

).
I pressed the heel against the mounted block, and placed two other blocks firmly against the sides of the heel.
It already held the neck tight enough to hold the weight of the template.
The screws protruded through the back of the template, so I went for my $8 angle grinder (thanks eBay!)
Then after using a jig saw to remove most of the MDF from in the would-be-pocket area, I flush trimmed it with my router.
Now it holds the neck snug enough to support it's weight.
Steve mentioned wanting to make this a Jag/split/Jag pickup setup, so I laid out a few parts on the blank...
This pickup idea reached me after I completed the template for the Jag/Split setup (which took way longer than I expected. Sorry for the delay! I'll have to work on this again Saturday or Sunday...) but it won't matter; I can move things around and make it happen.
Oh yeah, I was going to do a totally simple and easy control route, using a forstner bit and 2 straight cuts just far enough apart to pass my router bit through, but it turned out my forstner bit was too small for the full-size pots. I plan to buy a larger one so I can make this method work in the future...
So now the control route is pretty standard looking...
But this build is otherwise about to be SO much fun

If you wish to make an apple pie from scratch, you must first invent the universe. - Carl Sagan