you haven't done a conversion until it runs, mine has been on the road now for about 6 months, and i still wouldnt call it finished.
you dont really need a circuit opening relay, i'm not using one, neither is a friend of mine who did a 4AGE conversion to his sprinter.
we just ran relays off the fuel pump output of the ECU, the fuel pump doesnt turn on until the engine is turning over, but this doesnt cause any problems.
if you were keen you could parrallel wire an opening relay of your own using two relays quite simply.
after you have wired the fuel pump, good luck, that is when my problems started.