The National Music Museum in Vermillion, South Dakota provides full-scale technical drawings of some historic instruments.  Here is a list of what they offer as of Nov 2018:

Full scale (violin/Viola/cello) technical drawings contain outlines, 5 (B&W posters) or 6 (colour posters) arching cross sections, f-hole patterns, and plate thicknesses as well as other details.

• Tenor Viola, Andrea Guarneri, 1664 (unaltered baroque instrument, black & white one page)
• Violino Piccolo, Girolamo Amati, 1613 (unaltered baroque instrument, black & white one page)
• Viola by Pietro Giovanni Mantegazza, 1793 (unaltered baroque instrument, black & white one page)
• King Henry IV, by Antonio and Girolamo Amati, Cremona, ca. 1595. (color highlights, two pages)
• Violin, Cerin, 1792 (unaltered baroque instrument, black & white one page)
• Violin, Stainer, 1668 (unaltered baroque instrument, colour highlights, two pages)
• Violin (“The Harrison”) by Stradivari, 1693 (colour highlights, two pages)
• Violoncello (“The King”) by Andrea Amati, ca. 1550 (black & white, one page)
• Violoncello/Viol (“The Fruh”) by Stradivari, 1730 (Converted into a violoncello with an adjustable neck by Jos. Wagner, 1831, colour highlights, three pages)
• Viola by Nicola Bergonzi, Cremona, 1781 (black & white, one page, hand drawing of arches and scroll only)