All the stuff in the pics above were done on a 4'x8'x6" Router table with a rotary table and the router spindle mounted horizontal.
Fred, Sounds like your 4" table should be perfect for the job. Just need a moter and some way of connecting the two. You could alway pull your y axis drive and hook it to the rotary and still use your 3 axis controll. Just use Y as A and wrap your part around a cylinder in the software.
Donny
www.whiterivermfg.com