Hi Mark,
Our PSS was installed by the previous owner, so I don't have much information. I know that they pulled the 1" prop shaft, replaced the prop with a Varifold folding propeller and replaced the cutless bearing at the same time. There is lots of room for the PSS, and I even replaced the Hurth transmission with a Twin Disc transmission which is about an inch longer than the Hurth, and was able to fit it in as well. So I think you will have lots of room.
The PSS is available for various prop shaft sizes, including the 1". I don't think it's possible (or at least adviseable) to install it with the boat in the water, so a haul out is needed to do this correctly. But I think the installation is fairly straight forward.
I really like it on our E30+. Let me know if you have other questions.
Frank