I've got no experience of use, but can perhaps help with your no. 2. I've got an R1155 from my grandfather which is in reasonably poor shape.
I found a thread on here which got me in touch with Peter, and the book is comprehensive enough to allow a rank amateur like myself to find restoration plausible, let alone an engineer like you.
I include a few pictures showing the level of work Peter has done in his 192 page book, to the extent of drawing every connection and describing in words and pictures a full strip down, clean, refurbish, reassembly and alignment.