I am actually a big fan of the Desert Eagle. My dad and grandpa have Mk Is, which means I have been shooting them since before they were really popular. But I honestly never thought of them as a CCW. If I did CCW one, I would have to think a shoulder holster under a loose jacket would be more comfy, but if that works for you, by all means...go for it. No one will ever accuse you of being under gunned, at least against another handgun.
I know the penetration Nazis are going to cue in here any second, but I still have to congradulate you on a novel concept.