Hi
As stated I have an RS8. Looking through the images here, you would have the core of the machine, ie headstock, bed and legs for the tailstock end. The tailstock looks complete as does the banjo. Your issues look to be the toolrest - but these can be made up easy enough and the Wadkin one is a bit of a strange shape. The motor is the biggest issue. That isn't an original so would need checking to see how good it is. The original may have been replaced for a single phase or evs version. The trouble is the wieght of the original is what tensions the drive belt, so if the new motor isn't heavy enough you will struggle.
Depends how much you are into your restorations to find out if this is worth your time. On UKWorkshop forum there is a guy known as Wallace who restored one, posting detailed info on how. Look it up. There's also a Canadian guy that did one with some videos on YouTube.
Daltons in Nottinghsm are the Wadkin dealer and brand owner, so are a good place to start BUT.... these machines haven't been made since the mid seventies and as far as woodworking machinery goes, lathes aren't a popular machine, so parts are like the proverbial rocking horse sh*t!! I'd love a spare banjo if anyone sees one!
HTH
Richard