I must admit that I didn't understand your sketches Dave. Upon further reflection, I decided I needed to shorten the track to 10'x2' (about 3.5x.7m) because that's the maximum width of my home office, and it would be nice to set if up in there when it wasn't in storage. So, two 2'x5' sections now. The swapout section will go along the straight. I think I'll make two swapout sections. First, an analogue crossover section for one car rallying. Second, a digital swapout section that will include both the powerbase and an XLC thereby reversible so that the track could run both analogue and digital in either direction.