OK, let's start with a little more information. Why is the room configured like it is, not square or rectangular like most rooms? What are the interferences inside the room (windows, doors, ventilation, plumbing, electrical, etc.)? Do you plan to include scenery (if so, you might have to reduce amount of track)? Providing this info will help us help you.
Finally, just one comment about current plan; how will you reach and maintenance issues (derailments, track cleaning, etc.) in upper right corner? Most designers recommend a "reach" of no more than 30 inches.
Chuck
