Chamfers on a raffles DJ case.

I cannot find the post (or the reply in a post) that describes how to do chamfers using a dremel. i have a scratched to hell raffles DJ case and want to try my hand at putting in some chamfers. they obviously wont be at the level of using a lathe or something like that. i have a vise and a dremel. what kind of setup do you use? dremel sandpaper grit, etc.?

thanks so much. if this was answered before, my apologies.