C42 is cruise capable!
I have a C42 Mk II, hull number 573. In answer to your question, I believe the the C42 is very "cruise capable". It is a strongly built boat, albeit not an Alden or Hinckley, and a number of them have been on extended passages.At last year's Atlantic City Sail Expo Catalina featured an exhibit showing the various blue water passages of a number of Catalina boats. With regard to the specific cruising ground that you mentioned, an earlier reply referred to C42 "Moonspun". He is doing exactly the cruising that you indicate. His website is good. You will see what he did to the boat.From a personal experience standpoint, I have cruised my C42 Mk II to Bermuda and back and I was very impressed with its sea-keeping qualities. I did make some modifications, including adding an inner forestay/running backstays to carry a staysail, bolts on the companionway washboards, secured the anchor locker,proper safety and communications equipment, etc. I actually talked with Gerry Douglas of Catalina about the kind of modifications one would make for offshore sailing, and they are pretty much the list above. Basically I equipped my boat in accordance with the offshore racing regulations.The disadvantages of the C42 for extended cruising includes the limited fuel storage. I would be most interested to learn about your increased fuel capacity. What did you do? Did you give up water tanks? Did you add additional tanks? Jim Goodrich of Moonspun took his fuel capacity up to around 170-180 gallons, but added tanks under the cabin sole where, on the Mk II's, water tanks are installed. I'd also be very interested to learn what other extended capabilities you have on #533.Best of luck with your cruising plans. I'm envious!!!Hope this helps, and many thanksMichael YorkeC42 Mk II, #573, Certa CitoPort Washington, Long Island, New York