That would seem to be one of the little Clarkson Verticals - Surus has a set of the castings in his collection
We only have the drawings for the larger compound (and a few scrappy bits captured on the internet). I can confirm that V4 is the part number of the bedplate.
Blackgates will sell you a set of drawings (I suspect the postage will be almost as expensive as the drawings
)
Our plans were to build ours with reversing gear (possibly).
Jo