Hi Eddie.

I've never had a lot of success using a Dobro live with a mic. It works in the studio, but I've always used a condenser on it which isn't really going to work on stage, particularly if you're moving about at all.

Also, remember that as soon as you drill a hole in any acoustic guitar you run the risk of changing the sound of it.

Mario's suggestion looks good to me. I've not used that particular model, but I've used similar things in the past with quite good results. I like the fact that it's not a permanent fixture and that there's no need to modify the guitar.

ROG.