Fellinger, do you still have two-strokes on your Sailfish? When I bought my '95, it had 2012 4-strokes on it, which meant that the area under the aft live well (which gotagrip just described) had some empty space.
Mine also has an access panel at the foot of the aft live well. I thought that was standard, but haring you and gotagrip talk, I'm beginning to think that maybe a previous owner cut it in for this reason? If you don't have one, I'll send a photo in case you'd like to do the same. Gives easy access to the area under the live well, which is roomy if there are no longer any 2-stroke oil tanks sitting there.