The servo is a small remote servo as fitted to the type 2 landrovers back in the day with a 2.3 to 1 ratio. The add doesn't tell me how much vacuum is needed.
If the manifold idea doesn't work i recall working on a ford turbo diesel some years ago and they had little vacuum pumps running from 12v so maybe another thing i could look at. Looking on ebay at vacuum reservoirs vw seems to do quite a tidy little one that would be easy to conceal.
Love this ideas and discussions moving things forward or in my case stopping them better.
Many thanks Bash
Have you thought about having a look at Youpullit at Pocklington area as you might be able to look at the vacuum tank before you buy to make sure you donít waste time buying one that might be difficult to fit, last time I was there they were good with prices.