Considering the amount of muck and water these units were operating in, why did the design not call for stainless steel exhaust systems.
Looking at the installations would the exhaust when rusty tend to fall apart sooner.
Excuse my ignorance, keen to learn but at 65 suddenly understanding that I really know little.
Looking at your work and attention to detail, this will be a nice carrier when you have finished. Wish you lived closer, would love to come and help.
Regards
Col Tigwell
Dowunder