most of those pics are of seperate construction.
if thats what you want , then you will have to sort the pad out first then add the Curbing.
thats why i suggested just paint the apexes in the colours you wanted, then add piping near the apex to prevent track cutting. when your up on the stand , the painted apex is easy to see, and a different infield colour again seperates from the track as well. ill see if i can get a pic for you from teh bunbury club where i race.