@SvenSvensonov , I also think that adding the stealth masts would be perfect for the DEX!
Interesting concept drawing. I foresee several improvements, that the drawing omitted, actually showing up on the DEX prototype, or its equivalent counterpart.
First, an AESA volume search radar, the SPY-1 (and similar AESA radars) is not a targeting radar - it's a search radar. Typically volume search radars operate in the low-frequencies... such as S-band and this gives them good performance against low-visibility targets. High frequency radars tend to be to targeting and telemetry and are smaller in size, such as the radar mounted on the CWIS/SeaRAM. AESA, preferably with a GaN and not a GaAs base will be more beneficial to maximize power output. Also, AESA has the benefit of enhanced electronic attack... though older radars such as the old SPY-1 could do so as well.
Luckily for Japan they already make naval AESA radars... such as this system onboard JS Hamagiri.
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Navy's Next Generation Radar Could Have Future Electronic Attack Abilities - USNI News
Second, the drawing doesn't feature a VLS system, and Japan should opt for the cold-launch method. Cold Launch minimized a ships IR profile, but increases the amount of space the VLS needs in a ship by requiring more plumbing.
If Japan really wants to emulate the US LCS, then a modular, "plug-and-play" type system would be needed to rapidly change the profile and weapons/sensor load-out of the ships.
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Third, the drawing doesn't feature an aft view, but Japan should opt for high-performance pump-jets instead of the traditional screw and prop. These systems provide increased speed, maneuverability and decreased acoustic and IR signatures.
No wake for wake homing torpedoes to find, just some bubbles that rapidly dissipate.
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Fourth, that mast has got to go. The trend these days is towards enclosed, high stealth masts.
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Finally, a stealth gun is needed.
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The concept for the DEX is great. An LCS type ship can fill the light-destroyer, frigate and cutter role.