Merlin HC3 to sea?
Start from scratch. Folding head, folding tail, reinstallation of lashing points which may or may not be sufficient for deck ops but have been removed as a weight-saving measure, full SHOL prog (HC3 not cleared for deck ops or in BR766).
Then the whole EMI/EMC process and thats before e deal with any airframe issues...............
Needs folding head, otherwise will be unable to work on LPD or LPH and tail as it won't fit in hangars (tail rotor tip 6.7m off deck) otherwise.