Slug coil, Positive DMM is North Start is Black
Slug Coil, Negative DMM is North Finish is White
Screw Coil, Positve DMM is South Finish is Red
Screw Coil, Negative DMM is South Start is Green
you *might* have to swap the screw coil ones around, but thats going to be dead obvious if you wire up the first humbucker by itself and test how it sounds with the following
Black -> direct to plug output
White -> connect to red
Green -> direct to plug ground
ignore all the pots, ignore the other humbucker, just run the single humbucker billy gibbons style straight to the plug and confirm its loud and confirm the chart above - switch the screw coil wirre around if its thin and weak.
I just looked at one of the humbuckers diagram and you are right that negative goes with positive in the middle. I think your color scheme is right on.
Before i looked at yours again i redid mine according to humbucer normal operation and i got same exact color scheme you said in your post.
I think you may be right. I'm not sure and if i'm wrong i apologize in advance. I'm not sure what you meant but neck pickups screws usually point north while bridge pickup screws point south when installed. Not sure if that's what you meant.
I can not plug this into guitar as there is no strings on it, no nut. I want to have all electronics built before i gave it to luthier for nut jub, restring and full setup. So it's all wood as of now.
You mean wire single humbucker to wires and plug it into amp via 1/4" cable?
I have an headache from all the thinking into this.
VERSION # 2 ...I THINK THIS MAY BE CORRECT. SAME AS YOURS.
GFS Pickups Rewire to SD Pickups with SD corresponding colors.

GFS Vintage 59 Humbucker (Neck 8.28k) – WIRE COMING OUT TO RIGHT – NECK SD PICKUP PICTURED
Slug Coil -- Black wire – Positive DMM reading – North Start – Black wire
Slug Coil - White wire – Negative DMM reading – North Finish –White wire
Screw Coil -White wire – Positive DMM reading – South Finish – Red wire
Screw Coil -Black wire – Negative DMM reading – South Start – Green wire
GFS Crunch Pat Humbucker (Bridge 14.63k) -- WIRES COMING OUT TO LEFT
Slug Coil – Black wire - Positive DMM reading – North Start - Black wire
Slug Coil – Red wire – Negative DMM reading – North Finish - White wire
Screw Coil -- Red wire - Positive DMM reading – South Finish - Red wire
Screw Coil – Black wire - Negative DMM reading – South Start - Green wire