One requirement for lil' yeti's makeover was fresh air. The Scamp originally had a ceiling vent. It was actually pretty neat technology in some ways. I just wasn't satisfied with how it was installed. Roof integrity was compromised by the old vent. The roof had actually sunk enough around the old vent to leak water inside when it rained. Unacceptable.
I removed the old vent in 2015 while summering in the precipitous White Mountains of NH. The roof hole was patched over. During the patch the ceiling was propped up and reinforced with extra fiberglass inside to correct and maintain proper shell geometry. Leak begone, permanently!