I meant to post a link to this yesterday, and got sidetracked. It is a very good analysis of what a business plan is and isn't.
This is where a lot of business plans, not just space business plans, loose it. They get so caught up in the technology or achievement, that they see that as the ultimate goal. What you have to do is establish not merely what you want to do, but what you want to do with it.
How true. Technology does not make the business plan. That's why it is called a business plan and not a patent. Who cares if you have a technology if there is no market for it? It's a long post, but there is lots of good stuff in there. Enjoy!
Thanks to Jay Solo for the link.