Removing the vertical stab is a pretty routine procedure for allowing airplanes to into hangers that otherwise would have inadequate clearance
Well I've never encountered that, but I'll take your word for it.
I'd think the bigger challenge would be moving and aligning that big tail barrel section without the dedicated tooling (as I noted earlier).
I'd say that's a understatement.
I may be wrong, but I don't think we'll be seeing any tents and cranes at Heathrow any time soon.