To make this i used the neck electronics and vitamins from a old donor electric guitar.
If my pick guard plate does not fit your electronics you can just import the blank pick guard + the desired hole punch parts in Blender and use the bolean->Difference tool to punch holes for what you want, where you want it.
Same with the main body. I added multiple bodies so you can make it fit for example a fixed bridge(non whammy) if you want.
To make holes to fit your bridge just punch the holes with cylinders in blender or more easily drill them out post printing.
Inside the Main body i have added space for inserting 8mm steel rods for adding stiffness to the body without using up all your precious plastic filament
I printed all parts with only 10% infill and added rods + used only soft strings and it plays like a dream!
I also added a couple of neck shim plates so you can shim the height of the neck relative to the body to suit your needs.
I even added a 2->3mm wedge shim if you feel the need for that.
The files here on thingie might get outdated over time. See https://github.com/rotorit/AMGP--Adapto-Modular-Guitar-Pro--3D-Printable-Guitar GitHub to make sure you got the most up to date files.