Not sure is it useful anot but the plate seems a little small. FZ20 is not resting fully one the plate and adding the plate increses the height between the plate to the tripod so the moment acting on the joints will be larger. Wonder will it wear off the thread faster.
If the plate can acts like a baynet mount just click in to the tripod, maybe that will be great instead of having to screw and screw.
From the read-up, it said the plate purpose is to place the tripod head
near the center of the barrel, enable access to the battery/SD door
when mounted and mounting of customs made external batt case.