I bought a Viceroy a few years ago, full bed version. The head and tail stocks are 3MT. The inboard thread is 1 1/2" x 8, same as boxford and you can get a backplate from RDG tools which may allow you to fit a woodturning chuck on. The outboard thread is a bit more awkward - 1 1/4 x 9 left hand. I haven't seen that thread anywhere else. Faceplates do appear on ebay occasionally but fetch £30+. Mine came with a metal chuck and a faceplate for inboard but nothing for outboard, so I bought a tap off ebay and am going to try to make my own outboard faceplate, or modify the thread on an existing one. I want to use the outboard for a disc sander, since I don't need it for turning ( I have a graduate bowl lathe for that, I only need the Viceroy for spindle work).
Check out lathes.co for some more info. The Viceroy handbook is available online as a free download. If you can't find it I can email you a pdf copy.
Do you have a single or 3 phase motor? Do you need to change the motor? If so, what I did was to unbolt the motor mounting plate, complete with motor attached, and winch the lathe up and away leaving the motor plate on the floor. It's a bit of a palaver but do-able. After the replacement motor is bolted to the mounting plate, lower the lathe back into position - getting the alignment right is a bit fiddly, as is getting in the bolts furthest from you, but again do-able.
I replaced my 3 phase 440V motor with a dual voltage 3 phase and now have variable speed which is nice to have. I also had to sort out a problem with tailstock alignment - the tailstock can be moved sideways as in a metal lathe. The casting with the thread that allows this was broken so I had to machine a replacement part, but all good now.
I think it is a well made, solid machine. Might not be as convenient as modern machines because of the non standarc threads, and no swivel head etc. but that lathe will last you a long time. The bed on mine is cast iron and about as heavily build as my Myford metal lathe bed. Rock sold.
K