To be fair Colin, things like taking a gearbox out is more common sense than difficult. You have to get enough clearance to take it out without putting sideload on the input shaft to avoid bending it.
It's the same for every gearbox. In our case it means dropping the sub frame. It's people that take shortcuts that do the damage. (kwik fit with airgun on wheel bolts for example)
So again any decent workshop should be able to do that.
It may be a special car due due it's limited numbers but mechanically it's still a car