Hello from Michigan
Your drawings before and after are not only a good way of doing it -- it is a must for you to decide what you want and to arrive at a consensus with the people concerned, Eric included for sure.
Remodeling is a specialty in itself ... and you may even have two different contractors involved -- one responsible for all the interior work, and another responsible for the exterior work. And each contractor may use subs to suit.
Also don't be surprised, that a contractor providing you a bid may suggest some changes based on his experience, some constraints due to existing construction, some code requirement, availability or cost of a particular material, and so forth. So be prepared to update your after drawings, if so necessary.
Your approach of before and after drawings is great for a contractor to view the existing situation and communicate with you whether he can meets your desires for the finished product 100% or to whatever extent.
The bidding contractor may also suggest some changes for cost-effectiveness as well, or to meet your budget constraints.
I will be looking forward to hearing from you how things go on this project. Have you decide on work start and work completion date yet?. Please keep us posted with the progress on your dream house project.