Can’t we tell anything from the style of construction? Time period? Country of origin? Thanks...
There are some basic conventions anyone can learn, and do. Don't worry about how they fit ~ just cut rectangular hunks.
Then, as you build trim to fit.
It'll look just great!
See Post 73
Pssst...I'm considered a research specialist. Everytime I see this type of "History Mystery" item....prepare for the inclusion of the item in a new book.