@redenigma One site I saw years ago said thrifty 17th-century New England housewives, lacking fancy loaf pans, used old coffee cans. Not sure where they got coffee cans back when coffee was sold in sacks -- if you could find it at all in 17th-century New England. But it was on the Internet so it must have been true.
I used cans some years ago without much difficulty. Lining them with foil would probably take care of the ridges, though it'd be a chore.
@redenigma I steamed mine, else it would have been a species of Anadama bread.
I got curious about "thirded breads" and now can talk anyone's ear off about them. As a descendant of at least three generations of thrifty and often poor people, I'm fascinated by them.