Sorry, I dont have any pics (my camera took a dump last night), but I have made and adaptor for mounting stuff (band saw, vise, electric motor) to the end of my lathe ways (slides). Its very simular to the way a scope get mounted on a rifle(but more secure). You would need to mount a "receiver" and bolt it to on your table and make the clamp part for the bottom of your vise.
It would probably be easier to mount the vise to the table and unbolt it when the full bench is needed.