In an 11' x 19' room it won't matter one bit where you place the RP PSU. The controller easily has enough broadcast range for a room much larger. So, place your PSU such that it minimizes the length of wire run.
Move the yard inside the turnback towards the front of the layout. Reach will be a problem as it is currently drawn. Add a switching lead so you don't foul the main while doing yard work.
Your sidings are approximately 3' long. They should be as long as your "standard design" train. 3' is a short train.
Industry in upper left won't work at all. Again, reach problem.
You have a nice space to work with. Perhaps browse some of the layout designs here:
http://www.layoutvision.com/gallery/There is a guy on MRR forum designing a layout in about the same size space as you have. Might be worth following his thread:
http://cs.trains.com/mrr/f/11/t/260185.aspx