> Also, if you check the official OSM wiki on notes,

It says "Don't use notes for yourself in a way which is useless to others. Although you can use notes as a reminder to yourself, you are also inviting others to look at it. "

You are no more an "official" representative of OSM than any other of the 2 million or so other OSM contributors.  

If you want to build a "what if" model based on OSM as well as some other data it's pretty straightforward to do so.  I'd suggest asking how to create what you need over at the forum https://community.openstreetmap.org/ .  