You certainly have a knack for clever track designs. I wonder what you might do with the space I have, using Scalextric (Hornby) Digital? Here's a thread I started a while ago:
There you'll find a link to the TrackPower TPC file, as well as some suggested guidelines for those who wanted to give it a try, but needed some suggestions to start with. Here's the image showing the dimensions of my table.
I'll say that I'm really happy with my current layout, but I'm always open to new ideas, and you seem to have plenty to spare.