The blog is located here: http://pianopricepoint.com/sauter-piano ... n-germany/
Piano Price Point
There was in fact a detailed factory visit with excellent photos posted on another dedicated site a year or two ago, which gave me great satisfaction.
Interestingly enough my local tuner/tech is not affiliated with Sauter (he's the S&S agent); he was familiar with the name, but had had no hands-on experience with them. On each visit since he never fails to say how delightful it is, and who am I to argue.