Exactly... You'll know it is there when it is built. I've tried this approach before. Have an idea to build something you want but haven't built yet. You end up

Exactly... You'll know it is there when it is built. I've tried this approach before. Have an idea to build something you want but haven't built yet. You end up finding that it difficult to build and expensive. You try and fail at getting the money you need and so you market it and hope that you can get other people on board to build with same idea. People won't have the same idea until you can make it clear what that is and so the more information the better.