Susie, those are fabulous crazy quilts.
Our guild just had a bed turning from a quilt museum, and they told us that if you want to maintain the 'antique-ness' of your heirloom quilts, you should not finish them. They said that quilts are as old as the newest fabrics and threads used. If you want to maintain the age, then framing is the way to go. If you add thread or fabric to a 1930s quilt, it becomes a 2017 quilt for example.