Biggest @#$dam 3 jaw chuck I've ever seen! Correct me if I'm wrong, but
it looks like it doesn't clear the bed.
If you're looking for something to cut perfect cylinders with, you
could rig something up with a lead screw along the front of your lathe,
and some kind of accurate track for the tool holder to follow, with an
adjustment for depth of cut.
You might want to check into machinery auctions, scrap yards that have
machine tools, etc. A lead screw (machined accurate, rather than
threadded rod) of any length is pretty expensive.

One possible source: old drum scanners printing companies and graphic
prepress shops may be getting rid of. They have a 2-4' accurate lead
screw in them and are obsolete.

Then again, by the time you buy and build all this you might just
excede the value of your lathe!