Don't touch #1.
I start on top at the 2-pin-connectors and pull down new wires to the intersection nefore #1.
That is possible without removing the rear shell as well, but you have to add the new wires on top of the hydraulic harness.
There is a minor risk of breaking wires in the rear lower bow, where the harness wil be bended another 180° when the roof package drives into the trunk.
I start on top at the 2-pin-connectors and pull down new wires to the intersection nefore #1.
That is possible without removing the rear shell as well, but you have to add the new wires on top of the hydraulic harness.
There is a minor risk of breaking wires in the rear lower bow, where the harness wil be bended another 180° when the roof package drives into the trunk.