Don't know about MM drills. I've channeled 4 different JD drills. Three FBs, and 1 FB-A. I wanted to make 2 from 1, but each drill had a drive gear busted on one side. Built the first 3, sold them for crazy money, then found the one pictured below. It's got the small seed box, and the fertilizer section works. Originally it was a 17-7, 17 drops on 7" spacing. Now it's 8 drops, will hold about 200# of rye or similar seed.
Here's another one, 7 drops on 7", no small seed box, but the fertilizer section worked.