I can only go by what a guy who chromed stuff told me when I asked about doing a strut brace for someone. He asked what it was made of. When I said steel he said that was fine, but if it'd been ali he would only do them if forced and not give a warrenty with it as it doesn't bond the same
 
What sort of turnaround are we talking, that is something that i would love, but couldnt afford to be without the car fo too long