Hello David. We found some information about the Bowman 49 Ketch in Bristow’s Book of Yachts (22nd edition, 1991), although it is not much and probably information you already have. We made a record you can find here: https://sailboatdata.com/sailboat/bowman-49-ketch
If your drawings are digital and you would be interested in sharing them, we would love to see them. If so, please send them to firstname.lastname@example.org.