It has been a couple of years or more since I last did a "What-If" but here is one I have just finished for a "What-If" GB. It is a conversion of the Airfix 1/600 RMS Queen Elizabeth 2 to a "Harrier Carrier".
The background story is that the Falklands Conflict did not end with the surrender of the Argentine forces on the Falklands but it became a much longer war with Argentina. The Royal Navy found itself in need of more amphibious ships and aircraft carriers. HMS Bulwark was to be brought out of mothballs and recomissioned as a stop-gap but due to her age and poor condition of her hull it was necessary to find another way to fill the gap. It was decided that the QE2 would be dropped from it's role as troopship and converted to a "Harrier Carrier" but with an amphibious dock at the stern.
The conversion entails removing all decks above the weather deck, building an island to starboard, building sponsons either side, with davits on the starboard side for landing craft, cutting out a stern dock and fitting a flight deck with lifts.
White metal Harriers and helicopters came from Tumbling Dice. Landing craft were made from plastic card and apart from the Airfix QE2 there are parts from another six Airfix kits.
Dave