When Manchester Airport asked "another group" for a way to do it and a cost, they asked for 2 things : worst case cost and realistic cost.
Worst case was everyone was being paid to do it and its taking 2 X 5 days visits.
Realistically the costs would have been sub 5K after all the lifting gear, transportation, accompodation and insurance etc... were all taken care of.
The "other group" were volunteers at a charity, so that charity could not be out of pocket in helping a massive company such as Manchester Airport, for who 10K would be loose change.
This was 2 years ago.