My first reo, a reo grand, will be here tomorrow and I kind of want to engrave the front plate. I have access to a laser engraver or two thanks to my job. I don't do much laser engraving (friends at work will be running the laser engraver) but I know that material type is important to know when you're shooting a laser at something. What type of aluminum are the metal reos made of? Have any of you successfully engraved a metal reo? Did you have to do anything special?