Gas tank location

[bitsamonkey]

Hi, I posted this question on a thread I started on the performance forum, but thought it belonged here....
I've recently acquired a '69 Seacraft SF. It's a little different from what I've seen in pictures on this website in that it has no storage cutouts under the bow gunnels and has a humongous gas tank that takes up all of the space under the console including the forward seat part. I wonder if anyone knows if Seacraft did this on the early models, or if there's an abandoned tank under the deck? I can't crane my head around far enough to see that far under the deck from the rear hatches. Maybe next time it's out of the water I can peek through the garboard drain? I'd like to have an under deck tank and a smaller console if possible.
Thanks in advance.