I always cut all the cables at the panel to longer than the width of the box as a minimum so you can remove them from any point in the panel to another and still keep the box neat. Nothing worse than having to solder a single cable a few cm longer because it wont reach.
I use a drill to twist each pair, makes it easier to trace the pairs if you have to fault find. Everyone has a different way of doing it, some just don't care and leave a birds nest.
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