For period-accurate profiles and assemblies, the APT Building Technology Heritage Library has 14,000+ freely searchable trade catalogs (c. 1880–1960) on Internet Archive (Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine, free scans) — indispensable for preservation work and for keeping interventions legible to a building’s era. It helped me match window sections and lime mortar specs on two 1920s rehabs in Boston this year; do you know comparable consolidated collections for Latin America or Southeast Asia?
Used the Building Technology Heritage Library to recreate a 1920s ogee casing; the trick was filtering by manufacturer and decade, then opening the PDF to zoom the knife profiles: Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine. Watch for ‘nominal’ sizes in the tables — field verify, since a 3–1/2" casing often measures shy. It’s a rabbit hole, but a useful one.
I’ve had better luck grabbing the original PDF from Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine and scaling from a printed dimension in CAD before tracing the profile. The viewer can distort a hair, so I check one known size first.
I skip the PDF and pull the JP2 page images via All Files: HTTP on Internet Archive (Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine) so the linework stays sharp. In Illustrator I set the scale from a labeled dimension on the page and trace the knife profile; it’s been spot-on for ogees and sash parts. Small caveat: scans can drift a hair, so I verify one known size before committing.