As two well known figures in Swedish maritime history Af Chapman, masterbuilder and naval engineer and Von Platen, initiator to the building of Gota Kanal, are both well placed in history writing in Sweden and with some foreign acknowledgment.
Af Chapman being the elder was active as master constructor and ship-builder for a generation of Swedish naval ships from the 1770s and instrumental in Gustavus IIIs aspirations to strengthen the Swedish fleet, to meet enemies to the West and East.
Von Platen, born into upper military circles, made a career in the navy from the late 1770s and up until the late 1790s, when he shifts into engaging in canal-projects like Trollhatte Kanal and later Gota Kanal.
In a chapter for the Swedish Naval Museum’s (https://www.marinmuseum.se/en) Annual Book centering on Af Chapman I add some higher to less familiar background to an exchange over time between the two:
Letters exchanged between the two and a diary written by von Platen on journeys with af Chapman’s ships in the 1780s kept in the Von Platen archive at the Royal Library in Stockholm shows both a surprisingly strong criticism from the younger von Platen and a collegial discussion on ship-building in the early years of the 1800s.
Reference to the book here:
https://www.diva-portal.org/smash/record.jsf?pid=diva2%3A1529157&dswid=-2419
@HasselgrenB on "Market and Planning - individuality or collectivism" 