There was only one mold set back then, the original 18' model simply known at an American SKier with a few variations. Believe it or not, back then a teak floor was an option. Although I never built one that way I did see one that was shipped to So. Africa. The boat was built as ussual with a glassed over plywood floor, then narrow teak strips were added lengthwise on top of the flooring. I did notice your engine removal process seperated at the bellhousing, I've never seen that before, standard proceedures remove the engine/trans combination from the boat leaving only the shaft.