I'm probably wrong, but I don't think you will find any holes when you cut off the grab rails.
You can cut them of completely, and neatly grind back to the main frame rail so there will be no evidence of them when you have had the frame powdercoated.
Frame will likely be black (goes with everything if I change my mind), but I want the rest of the bike to be luminous red, if I can find the right colour. Saw a couple of the TT bikes and a sidecar painted in it and it looked… different lets say.
A bit like the red on the 848 EVO wheels, but brighter