I posted over in the Audio section, with no response. Hoping someone around here might have a suggestion. I need to cut a hole in my center stowage of my Mk6 to fit one of these

where the coins are below..


Access is limited on both sides by the shape of the stowage, so a hole saw is out of the question. Ideally I would like a nice neat hole and not a hacked out job.

What sort of tool should I be using to do this?