Another consideration. Should the business plan be a document that is focused on selling an idea for a product or service? For many years I worked in a company that did not want anything in a business plan that could be construed as showing a bias towards or against a project. The mantra was to only present facts in the business plan. The Operations Research Department was there to review the analysis as being unbiased. To handle the "what if" scenarios or sensitivity analysis we prepared a supplemental analysis documents which were mostly financial oriented. Personally, I like a factual approach and use the presentation of the final document to point out the conservative aspects of the content.
No doubt there would be a lot work to do to do a plan like this. You would need to figure out how to put it all together, do all the calculations, do a lot of what if's, etc.. And I'm sure one of the biggest things would be, would you actually take the time to do something like this or even have the time to do it? You could pay someone to do it but that would probably cost you a lot. Plus if you did that, most likely it would require a lot of back and forth work to get it just like you wanted it which would be even more expensive. But even then, would you spend the money to do it? There is a better way. If you would like to develop a nice plan like this for yourself and give yourself a good shot at making your life better, then find a planning software that does it all for you.