If they where free, and my goal was to have a shop for as little money as possible, I would not attempt to move these metal silo's or grain bins, or whatever they are. Taking them apart is going to be a huge project. Transporting them is going to cost thousands. Assembling them will probably be a lot harder then taking them down. Will you pour a concrete pad for it? Will you insulate it? Do they leak and how will you seal or fix the holes that might be there? How much rust is there?
Do you have any fear or issues with heights?
Lets say that you go through all the work and cost of getting them set up at your place. What will it cost to add a shop door? How will you finish off the interior space? Will you have to add stud framing to the interior walls to create a way to store stuff?
There is no cheaper way to get square footage then a wooden pole barn with treated pole set in the ground.
The only reason to tear down an old building, and then rebuild it somewhere else, is because you really LOVE that building and the decision is based on emotions. No finances.