It's clearly a 13'er. The entire galley is street side and immediately abutted by the dinette on one end and bunks on the other. The camera angle on the street side photo makes it look longer, but the curbside photo is clearly of a 13' Scamp. In molded fiberglass parlance, that's a 10' cabin on a 13' frame tongue-to-bumper.
John, I would make a serious effort to save the headliner before trashing it. It serves a number of important functions- condensation, light
, and sound control as well as insulation- and replacing it requires taking out all the windows
and interior cabinets. As Carol says, the headliner is marine grade and made of non-porous material, so mold and odors are on the surface only. Many people have been surprised at how nicely it cleans up. Bubbles and loose spots can be re-glued.