@SaMurray There's ample fore/aft movement (if that's what you're referring to?) in the dropouts for a SS/FG conversion and it was one of the primary reasons I bought this frame/bike as that was my plan - to SS it. I have pasted a few pictures below of these frames converted to SS/FG and can measure the actual dropout length if you wish... let me know.
Mudguard bosses? yes, there are mudguard bosses both front and rear.
Tyre width? The tyres in the photos are Strada LGG 28mm on Mavic CXP21 rims. Many people are using 28mm on these frames, but in some cases (as in the case in one of the pics below) 32mm's can fit. That would very much depend upon the actual tyre and rim you use though.
Do let me know if interested as I have the groupset on eBay currently (not the bike itself).