Can't help with the manuals, but am mildly jealous!
We had a bunch of Varnamo mills in the Canadian Forces, at some point, some forward thinking individual bought a couple containers of them and force-issued them out to the many machine shops the Canadian Forces had at the time. Along with a very nice selection of accessories from various sources.
Great mills, very intuitive to use, as the power feed levers all tended to move in the same direction as the table.
One of the issues we did have, was that the ones we had, had a phenolic or similar 'nut' on the table rise screw, and if you pushed the table crank over a bit too much, you ran the screw off the nut, causing it to then drop, with the end result being a stripped nut and the table landing hard at bottom.
Our solution was to replace the nuts with a nut made of Bronze.
IIRC, ours were UM3 size mainly, and were equipped with a more or less standard vertical head on the power overarm, plus the universal head as yours has, mounted on a swinging support so it could be swung out and mounted on the horizontal spindle. Tried Tony at Lathes.co.uk ?