Hey D-Mouse,
I also like the look of the racing lines through the turns. Before I did my 2nd track, I drew out my track "shape", if you will, before getting into details about routing & racing lines:
Check out this post to see how I drew my track, then drew in my racing lines.
Track Plan
Then when I drew it out on the MDF, I not only marked where the routed slots and skid aprons would be, but also the edges of the 'pavement':
Drawn out on MDF
It's not exactly high tech, but with some careful planning, it can look pretty good IMHO.
Cheers,eh!