1894 Brown's directory: Clucas and Duggan, shipwrights, boat and canoe builders, block and spar makers, shipyard
(the shipyard is just across the river in North Ramsey). Most likely company reports held in Manx Museum - there are descriptions of the shipyard in Constance Radcliffe's books on Ramsey

Duggan is a well established Manx name (see IGI) but there were some Roman Catholic Duggan families which may make searches somewhat awkward. There are many mentions of some characters in Manxnotebook