Welcome to the forum Dave. Of course someone like me was going to suggest that you take a picture of the table and post it for us to see what you're working with. Makes things easier and cleaner. I had 2 of those Craftsman metal router tables and I can tell you that it was more of a pia then any help. Not very stable so only the smallest pieces of wood could be done and even then too much vibration. You need and want something stable that you can secure, clamp if need be, and have rigid enough to be able to press the wood against the fence without moving the fence or table. It would be far better to take a flat piece of wood, maybe plywood, mark your router plate holes, drill, countersink, and secure the router in that manner. For a fence you can use a simple but straight say 1-2" thick solid board clamped. That would be the simplest table I'd use and of course that would likely need to be clamped to keep it secure while using.
On the other hand if you know this is something you're really going to do a lot there are other options. For me I built my cabinet. They can be very simple to extremely elaborate. I used the plans from
here which includes the homemade fence. For mine I simply built the cabinet and bought the fence, table top, and lift. And mine gets a ton of use. Best shop project I've done if you ask me. I also made it mobile for ease of moving it. Or you could spend a good deal more and just buy a complete router table with/without lift, dust collection, split/solid fence, etc...
