Different kinds of specialists are working all around.
As you enter the building site you may see the fixing of the front arches.
It is also interesting to see how the tubes are laid out for the under-floor heating system.
At a specific part of the wall, to the right of the interior, one may see the source (like a board for the electricals) of the heating.
Near the Sanctuary you can see how those tubes are covered by cement screed.
On the top of the building the specialists on copper works are placing the copper leaves on the Bell Tower.