I drilled a hole in mine. It's no big deal. Just be aware of what type BB is in the shell and don't drill into the BB or spindle. Though if you hit it and mar it, it likely isn't a big deal either.

But be sure you know whether the cable stop on the chain stay is on the top or bottom. That will tell you if you should be using a cable guide over the BB or under the BB. My old Raleigh was over the BB and the cable guide was a clamp on.