I think Chris has the best idea yet, I to am using a an arch that was designed to bee 4x12 but am only cooking on the finishing pan what I did was I removed the flue pan and built a new end and stove pipe adapter but kept it all "loose" so to say so I can go back to the big evaporator when I am more comfortable and have more help (kids)
Custom built downsized Small Bros. arch and leader pan
Carrying on the wifes family tradition with the help of my brother and my cousin
two miles of almost impassable woods road to get to the sugar bush and shack (heaven)