It is 49 Inches Long, by 8 Inches wide, Fibreglass and looks well moulded, have looked through old mags at the manufactures but not found anything yet.
Re the film, all I seem to be able to remember is that it was a couple an they either found them selves mysteriously on the ship like you do and that bodies from the pool were trying to pull them in, but I do not remember it being a liner or such. Not sure if there were any scenes like that in Amityville or such.