Apparently the tank sat in this fellow's yard for almost 10 years as a storage container for odds and ends. I drove by this thing for close to 8 years now thinking that it would be a great observatory. When the leaves came off the treees this fall and I saw the hole in the end... Eurika!!!
Anyway. I've attached the "inside" photo in reference to the other end. I know domes are hard to come by, and originally I was going to cut the end off and toss it in the trash - if anyone wants this end for free, it's up for grabs. The hole is an odd shape - the guy I bought the tank from told me that they had to cut one of the ends out for transport, or it would still be considered a tank. It's almost the perfect size for a scope anyway. I think when a set of shutters would be made for the opening, any openings that fell outside the frame of the shutter could be patched up without too much work or difficulty. If interested, PM me here, and we can arrange for pick-up.