There is only little to none information on catboats in german magazines and european respectively. For german magazines rather the "Yacht Classic" can be
recommended. Testreports and articles about catboats can be found in previous editions from the years 1904-1981 of "Die Yacht" in the "Yacht-archiv".
As in the USA and partly also in England some excellent clubs exist about education in traditional boatbuilding also various magazines on these topics can be recommended.
US magazin for builders, owners, designers of wooden boats; published 6x year
US magazin for sailors and owners of classic boats, as well as beautiful new boats and sailors who love their boats; published 6x year
US online magazin for sailors and motoryachties and seamanship. For everything around boats with videos, pictures and useful links.
US magazin for small cruisers and trailer boats; published 6x year
US magazin for Do-it-yourself builders, the magazin is targeting people who like "messing about in boats"; published monthly
UK magazin for affordable, traditional, wooden cruisers; published 6x year
UK magazin for enthusiasts of classic yachts and vessels; published monthly