I was thinking of adding a light bar on top of my 05 TB. I saw a link sometime back (long lost), of a kit that attaches to the luggage rails. Basically adds a third row to attach lights.

Has anyone done this or the traditional way of drilling to the roof?

Can't say I've seen any, but it's do-able. You might want to beef up your charging system before hand as a stock capacity battery might not be enough.

Joel