Kinda' a cool ole' hull ... welcome aboard Robin:
You can spend a little time lookin' around in
HERE and see if anything comes up similar. You can also just Google 1956 Fiberglass Runabout Boat and look through some images to see if anything similar pops up ... there are a few antique glass clubs out there that have good photos up.
The tag on the back right side (2nd photo) has some numbers on it. Doesn't look like the registration, do you know what that says?