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You'd have to be very good at calculus to calculate the volume of a plug. It is easier to submerge it in a full graduated cylinder and measure the volume of water displaced. Then weigh your plug/hooks/wire/grommets and subtract that from the weight of the displaced water (which you can calculate by knowing the volume - be sure to use saltwater's density). That difference is the maximum weight you can add before it sinks.
It is much easier just to turn a body, wire and rig it, then add weights held on by rubber bands and move them around until the plug floats as you like.
There is more art than science in building a good plug.
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