Hi, Linda. As you know, metal cabinets are pretty rare in kitchens today. Since most people working with kitchen cabinets are working with the wood ones, you have to find someone who is used to working with metal. I think that you start by going to your friendly local auto body shop and all the local auto parts stores. Ask if they know someone who is a good bump guy and who can prep and paint something special. When you find the guy that is heavily recommended contact him and then tell him what you need done.
A guy like that will either have a shop at home or a deal to where he can paint in a shop on weekends, so you may have to work around his schedule a little. This kind of metalwork is not as challenging as auto work but it's probably a good break for the guy. Discuss how much Bondo he is going to use. You want him to use as little as possible. Then you take him to your kitchen and ask for an estimate. He will want to take the cabinets off the wall and do them in the shop. If you want a job that will last another 50 years or so, let him. You will also want to get a firm idea on panels that are rusted or severely dented. He may want to replace them. Do you want him to or to just use his best efforts to salvage them.
I would guess that Muncie has plenty of people that are skilled in various kinds of metalworking and looking for work like this. If you can't find someone through the auto places, put up an ad on the supermarket or hardware store bulletin board. You may not be able to get references on doing work like this, but you should get a look at the auto body work to see if that meets your standard. Again, kitchen cabinet people today are specialists with wood. Metal cabinets require totally different tools and techniques.