MSF stands for Michigan Steel Fabricators, my buddy's business. He welded up my design and water tested it for me.
Big Bertha could have a insulated jacket installed and be outside, I designed it to be able to go outdoors if I decide to sell it.
The building is an old 'cold cellar' or ice house or ??? Stone foundation, had a cedar-shake roof that was falling in. Rather than bull-doze it, I decided to remove the old roof and build a new one. a few years later it became my boiler room.
In the photo below, which is the only photo I have of the building with the old roof, it is behind the car on the right. The car is my '33 Pierce Arrow, the fat guy is me when I was eating too well. and shaving too little..