Rocking chair conversion

I've been asked to turn a chair like this...
or urcaochr&gids=p088
...into a chair in which the owner can rock her newborn to sleep.
Right now I'm leaning towards getting a swivel/rocker base from Lee Valley (link below), and attaching it to the bottom with some sort of apron.
Should I be worried about the joints of the chair failing due to this type of retrofit? Just wondering.
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