It looks to me like a very good operations plan.To operate this effectivly you may need 4 or more people.Do you have room for that many and that many operators as friends?
Its a very ambitious railroad and will be not only time consuming to build but expensive as well.the yard alone is going to get quite costly.
I dont know how much time you have to devote to building and maintaining but this layout will eat up alot of time.
If you work a full time job or go to school fulltime this could very easily take you over a year to get operationaland twice that to get scenicked.
I would consider building this as modules if there is any chance you may need to move in the future which will also add a little time.this will of course help to have something to operate while building the rest much sooner.
I dont want to dampen your enthusiasm here but this is alot of railroad for 1 person to try to build.consider this carefully before pushing forward at warp speed