Linda,
He could indeed, he'll just have to make sure that the treadle belt path matches up.
You'll notice that in my picture I have a plain top. Its the top of a Singer coffin top type cabinet and Free company irons. Its what Treadle On members term a "franken" treadle.
Here's the webshots album with just the irons before I decided to use them.
http://good-times.webshots.com/album/561693025dGRxEd
Sharon