Nathan,
A Hohner Student 32 is simply not worth making a project of, period.
The Mylodica, on the other hand, has value because of its uniqueness and wooden case (though not everyone is enthusiastic about as a playing instrument). The Melodyhorn will require modification, as you can see examining the one that’s in there, basically closing off the end where moisture is vented. I don’t think that should be too challenging. Ideally, the Mylodica would be modified so it includes moisture venting.