The bait looks very nice already , but to make things easier , I would have made the separation cuts prior to putting the body to shape(still in the stage of a flat wood board) .
For one separation I'd employ alltogether four perfectly aligned sawcuts leading down from back , belly and either flank , leaving a ridge in the center of body to still hold it together , until all outer shaping is done .
Also a lipslot and a slot for the tailfin I'd cut at this stage prior to shaping .
I haven't quite done this on my first swimbait as well , shown in my thread "swimbait , very first attempt" , but only because the shape of my bait is kept quite simple , the flanks are rather flat and no details carved in , so I could handle the transitions from section to section just by eyeballing , but I think , when making a more detailed lure like yours , I would go with that method described above .
Its quite tricky now to fix your lure for accurate sawcuts , you also might put blemishes into its finished shape .
But at least now I know , how a gizzard looks like , don't have them in Europe , but looks much like our native bream , only that one gets twice as big
greetz , diemai