To answer the question about stripe tape..go to your hobbie shop and ask them for pin stripe tape used on model aircraft, boats etc.
To get a registration number (sail #) go to the AMYA Web at: http://www.amya.org/ go to classes of yachts, and find yours. You will register with your class secretary, and he will assign a sail # to your yacht.[8D]
Sorry, I can not help with custom decals.[&o]