Earlier quoted context omitted.
Cool to see this! Most people will never build their own home these days (even with the cost savings).
A problem is that you can't get a mortgage to build it yourself. Being cheaper in the end doesn't help you if you don't have the money right now.
Here is a link to a book that lays out a very good strategy:
https://books.google.ca/books/about/Mortgage_Free.html?id=U8...
(warning: although I read this book and considered it's approach, I used a slightly different strategy towards home ownership without a mortgage that allowed me to purchase existing homes)