Sentence:  Heere we made a double floore in the hall where the shippe was <WSD>abuilding</WSD>, so that the wild men, being ignorant of our way of building, could not take any notice of our cuningnesse, which proved to our desire. 
Meaning of the word marked with <WSD> tags:  Being built or under construction, as a structure or a vessel. (First attested in the mid 16th century.)<ref name=SOED>(page=10)</ref>