It's probably time to invest is some guitar-making books.
The one I've got, "The Mechanics and Construction of the Acoustic Guitar" by Eddie Green has a lot of stress theory in it, and concentrates on acoustics, but has a fair amount that also relates to electrics (and a couple of sections mention solid body specifics). It's reasonably priced for a big technical book (£24 in the UK) but only comes in hardback form, no Kindle or pdf version. It may not be available in Australia though.
https://smile.amazon.co.uk/Mechanics...ps%2C66&sr=8-1
It also concentrates more on the general theory of guitar construction rather than on practical building techniques, so it's worth looking around for others that focus on the practical side. Unfortunately they are generally limited run books so don't tend to be cheap. I'd definitely recommend the above book, but it is very technical in places, so you just need to ignore some of the equation sections and get to the conclusions and plainer English sections.