Identification help to assist with repair of odd cantilevers  

This is my first post, so please forgive any faux pas.

I picked up two upholstered cantilevers for 15 dollars on Craigslist with plans to reupholster. Once home I realized they had been altered from their original design. A plywood seat was made to fit over the cane and then upholstered very badly and with little concern for the cane or frame. Once I removed the new seat and upholstery, I found the original chair design and aesthetic to be solid, well made and attractive (for my taste) I would like to return the chair to as close to original condition as I can, but I