All y'all are making me wish I was real close to Iowa! Love shooting get-togethers, lots of chat, new friends, and LOTS of powder smoke!
I have a few Amish friends here in north-west Ohio. They all love the shooting sports, and most have muzzle loaders. I think the majority are using .54 cal. I usually take my American Rifleman and Muzzle Blasts over to them - they are appreciated. I belong to a rifle range group here, and from time to time, take a friend along. And they are ALL interested in the flinter I am building.
Sometimes, if I ain't hurting too much, I do go to church with them - and the great meal afterward. We are not too different religion-wise, but I am NOT going to give up my computer and car!
So, take your Amish friend along, and let him get the powder smoke and building addiction!