OK, finally some photos of the two halves of the base pan that form the "base burner" pert of these base burner stoves.
First we have the upper half, which bolts to the skirt of the stove and forms the floor of the ash chamber. You can see it is badly cracked and warped. One corner has broken off. The near side is the back of the part where the exhaust gases go down into the base and return back up. The far side is the opening for the ash pan.
Here it is rotated 180 degrees. Easy to see the crack/break in the back wall
Here it is flipped over. Yuk, creosote!
Next we have the broken apart bottom half. Hard to make out in the photo but the divider that separates the incoming from the outgoing gases is there in the center.
Both pieces sort of pieced together. A few small pieces missing here and there.
SO. I've talked with Tomahawk Foundry and they have never had call to make these parts. We had a long talk about making the patterns and I expect to have more discussion with them if I attempt to make them. It will be a huge project so we'll see what happens. I'll also send them these photos and see what they think of piecing these parts back together to use as patterns. There may be a way to deal with the shrinkage.