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How to stop a crack forming/spreading from the drilled holes?
I used a thin dremel bit to smooth the edges as well as I could.
You weren't worried about drilling through the DT with no reinforcement?
Yes. But then I did it anyway :) hasn't failed yet, I'm 80-82 kgs + handlebar bag.
Did you open up the rolled edge of the GB 'guard and run the co-ax in there?
I didn't have to open it up, lots of room. I had to give it a squeeze here and there to keep the coax in place, rather.
Idk about VO guards but GB were no problem.