08-04-2013, 12:35 AM
You could always do away with the runround and propel everything on the layout,using a fiddlestick or extenstion board which plugs in or drops down when not in use (where the A is,like Shortliner said).
Points are peco small radius (24") and minimum radius is 20",this would give you enough switching and room for your buildings,(with a bit more fine tuning).
I would definitely do as Shortliner says about templates lets you work things out with not a lot of cost,good planning saves you more in the long run.
Have fun
Ray