I cut out a small aluminum frame for a customer the other day. With parts like this you really need to plan ahead as to what to cut first or you can end up in a spot with nothing to clamp onto. The part had several 2mm x .4 threaded holes in it. Makes a person nervous cutting those. The tap can break quite easily and ruin the part.
If you are in need of a small machine shop to do one of a kind parts take a look at my web site.