Anyone home made a double post banjo and tool rest?

I have an old Vicmarc VL200 and need to turn a volume of chair legs at about 620mm each. I only have the 200mm tool rest that came with the lathe and one banjo and don't fancy moving it up and down the length of every leg over 24 legs. Has anyone made a double banjo and long tool rest combo for their lathes or know of someone (or a video of someone) who has? If so could you share a pic or a rough description how it was done?

I am pretty handy making jigs, and know how I would do it in timber, but I'm unsure of the forces involved and how strong I need to make this thing. Is a timber version going to be OK, or do I need to find myself a metalworker for the job?

thanks

pete