For some reason there is no reply button in David's original posting
David's question -
What is the minimum recommended center-to-center track spacing for 1:20.3 scale both for straight runs and curves? I will be using both 5 and 8 foot radius curves.
I use a 7 inch center to center spacing (it might even be on 6 in spots

) on the straight aways and a bit more on curves. I'm only running 1:22.5-29 scale stuff. You probably want to have a 8 inches for 1:20 and more on the curves (maybe a lot more if you're getting one of those new K's)
-Brian