Anyone with experience here? Is cabling run outside to ground floor or other tricks used?

single or double cable?

yes there are tricks involved.. the installer should know them all.. if not a couple...

this is why one pre wires...

....but if you were unable to prewire then usually it means running the cables on the outside.

You can usually hide the cables though under eaves and beside downpipes etc to neaten things up a little.

What is the situation that you are trying to overcome?

No issues. Looks like the pre-wiring was all done. Just hidden.

Cheers

Cool!

Now that is a good news story