Yay! Working now. Chronos was worth the effort, me thinks. Thoroughly enjoyable and just a wee bit different to anything else (in a good way).
My problem was that the batch file was falling over when trying to copy the PSMove drivers to the Steam/Steam VR directories (odd location, environment variables wack, dunno).
To fix this, I opened up the .BAT, copied the indicated files and ran the executable to add the driver manually. As soon as I'd done this, I fired up Steam VR and happily spotted the PS Eye icon. Chronos was fine after that