Very nice plan! A couple of thoughts... First, I would leave the track dead level, and just let the scenery change elevation. Drop the scenery surface and put the track on a fill, or on trestle bents. The resulting illusion will be much more effective than just putting a hump in your mainline. You'll avoid operational difficulty in the long run. Second- I would extend that "triple track trunk" from the right side all the way around the top, such that a train could proceed from the yard to the branch line on the right without getting on the main.
Not only would this allow a local from the yard to access the branch, it will allow you to switch the yard without fouling EITHER main line. So you could independently operate up to three trains at once. If you make this change, I also think you should extend your yard tracks around the corner to the sofa. With a longer effective yard lead, you will still be able to "double" a full-length cut of cars from one yard track to another. You should also add a pair of switches in the yard or on the yard lead to create an "engine escape." This will enable the yard switcher to run around and get on the front of its train before it heads out on the mainline.
It seems like you're pretty well-versed with SCARM and the whole planning process. But if you would like help, post your SCARM file and I can try to work these edits in so you can see what it looks like and test it with the MTS simulator.
