You done good and yes electrical isn't that complicated as you see with DCC. One suggestion on it and this is easy to is to cut the Dixie Central into power districts. These will act as blocks and really will
give you better distribution and trouble shooting ease.
Ok lets change your priorities. Move Civil and Electrical to the top two positions, Structures is an on going project and I would put it third. Scenery you are nibbling at, so put it fourth with cars dead
last as nothing other then gathering the material for them has begun. This will allow you time to gather the materials for them and then gang build them as they all have the same underframe.