aluminum and stainless steel need to be cut with different lasers. stainless steel requires a very large laser, whereas aluminum just requires a large one. lasers that do both are very very expensive and if you have to ask how much time on them costs...
anyway, without looking at the DWG, i'd talk to acidfire about the aluminum, assuming it's thin. for the stainless stuff i'd honestly just respec the design for all aluminum. 6061 is really cheap and everyone is set up for it.