Assembly went a lot better than expected. Unpiped internal cable routing was a new experience, but got it done without any major dramas. Had to run a new rear brake line as well as cable inners & outers as everything for the rear was too short, but gears are already tuned, back brake bled, suspension semi-reasonably adjusted, and she's ready for a spin tomorrow. Kudos to Summit Cycles Melbourne for helping out with just supplying a frameset from what was a complete build (and keeping the frame pretty much unmarked too), and praise be to Transition for actually having a well-aligned derailleur hanger straight out of the factory!
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The random creak under pedalling (only) has reappeared in the rear wheel though, so will have to look at that again in future. But for now - close enough!