Ho Train layout Design

Here is the latest version of my Ho Train Layout. It's a 2 main line, shelf layout around in a 11'x16' room. The yard (at the top) is below the main lines and the loop in the center of the room is used to gain the height needed to get up and down from the main lines. It is a tough room to navigate. The entrance door is the grey area bottom left of the diagram. The mechanical room is the grey area near the top right of the drawing both will have lift out sections. I also need enough room to replace items in the mechanical room if needed so there needs to be a clear path from entrance door to mechanical room.

I have started stage 1 which is building the shelf around the room. The idea is to get both main lines running first then finish prepping the room, lighting, power etc.  I need to be able to run some trains man! Stage 2 will be the yard and center loop, stage 3 will be the turntable and branch line (inside the loop). Once stage 3 is running I will develop some sort of scenery plan that will buffer the center loop from the back side of the room.  This will give the layout some depth and make you walk around back to see everything.  Where as this design is not complicated, it's nothing fancy it gets me the access I need in the room and will serve the need to run some trains.