BAZIL,
Great start with the construction of your Train Room, real nice video. Just purchased a new home myself, and now have built my own Train Room also. You might consider a Bar Type Layout near your Electrical Boxes, I am very satisfied the way mine came out, and it gives easy access to electrical Boxes, and the Bar becomes a Tunnel for your Trains to run thru.
Before you build your floor layouts, consider a over head Ceiling Shelf Layout, around the room, they also make the room look seriously cool! I inclosed my Electrical Boxes in the wooden slat type panel doors, you see behind the Hellgate Bridge. Accessible by walking behind the Bar, it really worked out well.
Great start sir keep up the good work!
PCRR/Dave