- Hylkes Feddes, like his father, was a builder of wooden ship. A trade he learned from his father as was the custom for a father to pass along to his sons. Hylkes occupation is listed as a "scheepstimmerman", which means "ships carpenter".
In the book of Lemmer TR11 HYP LEM, book 50, p. 66 it states "Fedde Hylkes, shipwright in Lemmer, owes to Harm Jouert Stapert, purchaser there, for the half and Gerrit Ridderinkhof, purchaser in Zwolle, for the other half. Amount of 125 guilders for wood at delivery of the koff ship now on my yard will be built and for my paid wood will be used".
Also found in TR12 HYP LEM, book 50, p. 67 it's stated "Fedde Hylkes, etc. owes to Jouwert Sjoerds Stapert, amount of money 895 guilders, in case of delivered wood, to be used at the koff ship. now is building on my yard, and will be delivered by the shipmaster Age Everts. Written January 29, 1791".
In TR13 HYP LEM, book 50, p. 134, it states "Feede Hylkes etc., owes to Haring Martens de Koe, shipmaster in Lemmer, amount of money 1800 guilders, in case of paid taxes for the buying of wood to the building of a "smak" ship for my creditor, Written November 16, 1796".