For the light frigate, why not just use the same hull power plants, etc., enlarge the mission bay and create a more modular system. Have a reasonable hull mounted sonar with good software, 24 or 32 cell Mk41VLS, good 3D and 2D radar, keep the 5in gun, Saab 9v or similar combat management system as much automation within the ship as possible, accommodation for extra bods etc. You save money with the hull and it will already have been set up for being quiet in the water. It is the internal compartments, fittings and superstructure that would have to be redesigned. For example you could move the mission bay and locate it below the quarter deck, hence making the mission deck accessible from the stern which will have advantages. If you don't have all the gucci gear like the Type 26 ASW then costs could reduce significantly (he says hopefully). If this variant could be in the water by say 2025 - 2027 then NZ may well be quite interested, because our two FFH out of service date is close to that time frame.