You certainly do have to either take a leap of faith because its a Schaublin (I did that) or be sensible and check and decide worst case what is required to get it working, cost it out as you can still get prices from Schaublin for key spares and then double that cost as a minimum!!! - if the numbers add up then push the button, I'm no engineer and my 135 needed work mainly around the Variator, was able to convert this along with a friend but still grappling with a high speed selector issue which is electrical and documented on another thread here on this forum - the issue still remains but probably down to my RFC and not the lathe but it's frustrating none the less.
These machines are a bit like an old Land Rover 90 or 110, I say a bit as the engineering on a 90/110 is a million miles from the quality and over-engineering of a Schaublin but they bring a smile to your face every time you look at them, even when they are not working
That in itself is enough for me.