FHL DGS 7595725 ("Town and vital records, 1727-1892") (https://www.familysearch.org/ark:/61903/3:1:3QSQ-G9NW-RK5) includes images of a volume entitled "Births, Marriages, Deaths: Town of Kennebunk" (book cover is image 7). This appears to be, at least in part, a Record Copy (EE, 1st ed., 1.27 and 8.5), rather than an original register, based on my assessment that over 100 years of birth records (1745-1883, images 11-59) appear to be in the same handwriting. Having said that, there are many additional entries, especially in the later years, that are of others' writing. Some of these are noted as "depositions" (e.g. image 61, and as noted in the film's description in the catalog at https://www.familysearch.org/search/catalog/137047?availability=Family%20History%20Library). It also appears a town clerk (later?) added indexes of these entries (images 104, 85, 312 for B,M,D respectively), dated 1918. I say later because it looks like the indexes were added where space was available, with the marriage index preceding the marriage entries and the other indexes following their entries.
Since the book cover/title is shown on the film, I plan to cite the book in layer 1, with the website in layer 2. So, finally, the question is, would EE cite this per the QuickCheck Model for "Local Records: Vital Records Register" (for layer 1)? That is, I'm looking at the guidance in 8.5: "... record copies officially created and maintained by public record offices are treated as 'original' records, when the actual original is not known to exist." (The catalog entry cites the Kennebunk Town Clerk as author.) Seems I should capture, perhaps as a note to the citation, some of my observations per the above. Does this source qualify as a record copy and simply use the QuickCheck Model?
Of interest, a second register, untitled, on this film, beginning at image 334, does appear to be an original. I have yet to review that register to see if perhaps it contains my person of interest.