The Type-071 suggestion has me thinking, it reminds me of the innovative Danish warships of the Absolon class, which are large Destroyer sized but have a roll-on-roll-off vehicle deck (!) and function as both destroyers and power-projection warships:
There are some similarities in concept to the US littorial combat ship concept, except much better armed.
The Absolon is a bit weak on air-defence and lacks a substantial land-attack capability, but it does carry 16 Harpoon anti-ship missiles and two large helicopters (EH-101).
The Absolon class is about 6,500t so our 12,000t monster could easily accomodate a broader weapons load. My thoughts:
1/. A multi-use space concept where the vehiclre deck, helicopter hangers and storage/weapons lockers are all interconceted:
a) Roll-on, roll-off deck accessed from rear and side of hull. Has a helicopter sized deck lift to allow it to be used as an extra helicopter hanger and to allow easy transfer of vehicles to deck for air-lifting or to fit in more vehicles (at the cost of helicopters).
b) Large hanger in conventional position able to carry two large helicopters (i.e. Super Felon).
c) A heavy duty crane.
2/. Heavy land-attack punch:
a) 16 YJ-62 tubes which can carry either anti-ship or land-attack versions
b) A large MRLS capable of handling both WS-2 (200km) and A-100 (100km) rockets with a reload locker which has a rear-access to the hanger, allowing it to be used for additional rocket reload storage.
3/. Modest but capable air-defences:
a) Sacrificing area-air-defence and AEGIS style system capability to make space for the MRLS and SSMs
b) 48 SA-N-9 Shtil or PL-12 medium SAMs in VLS
c) 3 Type-730 CIWS'
d) 2 x 8 QW-4 point defence SAM launchers (unmanned)
4/. Consideration to in-shore defence and in-dock defence to reflect international intervention role
a) 76mm AK-176 gun
b) 2 x unmanned 25mm guns (Based on turret of WZ551 APC)
c) 2 x shielded, manned heavy machinegun mounts with automatic grenade-launchers
d) Some sort of comfortable pillbox for the sentries guarding the accesses.
5/. Modest ASW capability
a) Large helicopter capability allows alturnative role as an ASW flortilla leader
b) Towed VD Sonar capability (not always equipped for cost/crewing reasons)
c) 2 x 4 SS-N-29 ASW missile launchers
d) 2 x 3 Yu-7 lightweight torpedo tubes
e) Hull sonar