YES Bencooper!
And it’s a fantastic book as well.
I once wrote a comprehensive business plan for a brewery startup (about 5 years ago as part of a course I was doing) and realised that I’d need 6 figures to produce in volume and start from nothing. I also had someone I trust read through it and critique and there was still stuff I’d missed. So I’d agree with dogthomson and say try it first and see what interest you get, then if you need funding, write your business plan. The main things investors want to see are that you have a handle on the numbers, a handle on the market, and are not a complete f**kwit.