True, the foremast does give the SMART a blind spot, but in many regards it doubles up on some of the role of the Sampson. T45s could have been almost as capable with out it. Sampson itself is a very weird set up- using 2 back to back active antennae reduces weight so allowing a higher mount, but then spinning them adds mechanical and signal processing complexity and risk of failure. Apparently the spin assists in the cooling of the high powered electronics too, but frankly, it's a pretty bonkers idea,and no surprise at all that every other system to put to sea has cone for four rather less hard pushed arrays on static mounts. Recent moves have been to concentrate all four fixed arrays together to pool support services (cooling, local processing) either in the superstructure (pace US designs) or in a large mast (Dutch, Norwegian designs) or extended superstructures (Spanish, Australian). The relative uniqueness of the Sampson system means that it is relatively expensive- the full development costs of the system are now spread among only six active installations. Still, at least the RN can shoot down cricket balls a hundred miles away, so we can sleep easy in our beds.
Sylver is the launch system for the Aster missile and though a Harponn fit for it has been proposed I don't believe it's been designed let alone built in the real world. The french SSM, SCALP, is I believe the usual ASuW munition for the Sylver fit. Notably the RN have not gone for SCALP and have instead put in some of the basic "plumbing" for harpoon on the T45s.
If you're going for long endurance you could look to replace part of the GT power plant with diesel engines. You'd still have more or less the same sprint speed, but a good long range too.
One point on your original, now abandoned drawing- the aft phalanx was placed on top of an exhaust stack!
You may as well look at more advanced CIWs set ups- phalanx, whilst still useful, has serious competition in the form of high rate of fire gun systems and compact trainable and VLS missiles these days. Depending on your anticipated threat mix, and theoretical budget, there may be more suitable and interesting systems to consider, many of which are already available on the parts sheets.
One final point on hull forms- the Type 45 is by no means the finest hydrodynamic vessel to put to sea. She's fairly cheap, and specifically designed to be modular in construction- ridiculous I know, but the UK now cannot do a simple air defence destroyer hull in a single yard (reasons may be as much political as technical). The upshot is that the hull form is compromised, and that vessels such as the Arliegh Burke are in may ways superior sea boats (as well as far more heavily armed, and arguably half a generation ahead in terms of systems development). The Japanese, Spanish, Australian and many other navies all have hull forms in their large escorts at least as good as the UK, and some are in some ways superior.
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