Hello John, Sorry to hear your helper has decamped to he other side of the world *♂️.
One suggestion I would make for power and data is by all means run the cables in / around in conduit but make that conduit as big as you can, I used 32mm conduit and struggled with USB cables. The powered ones are really stiff and don't like to bend, a better solution would be to have used 90mm stormwater pipe - for me anyway.
Ed
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