I helped a friend install a set of Kato davits on his Hunter 40.5. last week. The Kato's are very similar in terms of quality. My friend only bought the two basic davit parts from Kato and then made up the cross struts, braces etc. himself. He used thick walled s/s tubing. He wanted his own custom design for also holding a solar panel. And he had a radar post mounted on the swim platform we had to deal with. It was not a stock boat to begin with. It needed to be fitted up in the boat yard. He did a great job on the design and it turned out very well.
Bob