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There's a special tool that would be handy for building up the wheel from the bead side but it's not essential. Once the nipples are on the spokes, a standard spoke wrench works fine for tensioning on the exposed square drive.
For the build up, I pushed the torx head into a piece of thin PVC tubing which enabled me to get the nipples through the rim and started. Or you could screw a spoke into the torx side a couple of threads to get it positioned.
Ta. Do those Squorx nipples need a special spoke tool?