I know everyone is trying to be helpful but some of the suggestions are complicated and will tend to be unreliable. Quite honestly there is only so much that can be done in HO in a 4'6" square. You have to take the space you have and decide what you can reasonably do with it. In your case it seems that you have first decided what you want to do and then you're trying to force that into the space you have. More often than not that is going to lead to a lot of frustration. My advice; trim your wants or find more space. I say this from experience.
Ray
Ray