Looking great, Trevor.
For the CAT6 cable, I think the standard cross-section is round, as I can't recall hearing of a flat-section cable.
As for the concrete, it's a tough call. A mini-load may not want to (or be able to) hang around whilst you run back and forth with the wheelbarrow, whilst DIY would be a slog (and very messy, too!). I presume you've done a cost comparison between a mini-load and DIY?
Cheers,
V
(I've mixed concrete before and whilst a mixer makes it easier, it's still a messy job.)
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