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Hey Baz, from what I saw of your obs, you would have to remove the dome in one piece by first of all reinforcing the base ring by welding some steel struts across at least n-s and e-w axis to stop it being warped.
the base section would need to be strengthened the same same way at the slab level. The structural steel beams already in place would suffice at the top of the base level.
Lifting slings would need to be used in such a way as to cradle the structure. If you use welded lifting points they would need to be engineer certified before a crane crew would use them (legal & insurance reason)
lifting the base would have to be done the same way with slings that pass under the load.
The crane crews also have spreader bars which engineer passed. These can be passed under the structure and have approved lifting points on them.
Then it is just a simple 4 chain lift onto a low loader.
I hold the necessary permit to hook up such a lift just let me know when !!!
To lift the slab with it would costs about the same as building a new one!
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