[munter]

I agree with all your points Jason.

I have built four routed tracks, each one to fit a new space as I have changed premises(house) The available space can dictate things somewhat.

Other thoughts could be in regard to elevation and flat or banked corners.
   
You would think that is a harsh corner with a little rise and a little banking and a change in radius but no, things flow....the worst corner on my track is where there is a sudden change in camber and some proxy cars with shallow guides rue their time here.

Another pet hate of mine is a short straight...better to have continuous curves. 

Please ignore the thingie plaster masters...I should put them away.