You should share those drawings in another thread so that the information is not lost. I'm certain more than a few guys could use it.
I will try to get them scanned, they are not letter format, rather closer to full sized for layout, on a type of parchment waxed paper, and like me, pretty dang old.
Getting a firebox to draw to the chimney is an art, and depending on if you need it just for heat or want to use for cooking and size of wood to be used are variables that have to be considered.
The engineering firm that my company owns may be able to help me reproduce those drawings.
