I remember Dr Heart used to post some hybrids pics from his jetski awhile back, haven't seen many posts on jetski fishing, is it practical?
I dunno about 'practical', but it does look fun. And it makes you pick out only the gear you really need because of limited storage space.
+1 on wetsuit (or drysuit I guess). Also a good lifejacket, pop-up signal flares in your pocket, and other safety gear.