I recently designed and routed this Headless Wonder out of a mahogany slab. It is similar to the Traveler Guitars that I have bought in the past. The Travelers are great and are well worth the investment if you are looking for portability and ease of toting a (full scale neck) guitar around...
Only from one source and not much detail but still a quick guide....
https://reverb.com/news/guitaronomics-how-much-does-it-actually-cost-to-build-a-guitar?_aid=newsletter