Was a CAM Hurricane heavily modified for use at sea?
Short answerNo. The only relevant change was fitting the aircraft to its launch carriage.
NotesA CAM Hurricane needed no substantial naval modification beyond fitting it to the launch carriage. The specialized equipment belonged to the launch installation rather than to an extensively rebuilt fighter. This made it possible to incorporate an existing land-based type into a shipboard system. The aircraft still had no way to return to its launching ship after the mission.