the old standby twin 20/30mm gepard style turret .
There's one on here!
http://beyondthesprues.com/Forum/index.php?topic=2068.0
YES!
I've been playing around with a what if "Merkava Multi-Mission Effects Vehicle" -- and it looks almost exactly like that (albiet with some short ranged SAM missiles as well).
Equipped with 2x 35mm Millennium cannons with AHEAD ammunition and 4x short ranged SAM missiles, the premise is that in conventional conflict it will provide group air defense, but in low intensity conflict it serves as a C-RAM for FOB defense for anything that gets through Iron Dome. The 3d search radar doubles as a counter-battery radar and can share predicted origin data to the artillery FDC for rapid counter-battery fire, and the engagement radar doubles as a ground surveillance radar with SAR capabilities to queue a FLIR onto an area of interest for further identification, again for FOB defense.
Other ideas I've been kicking around...
-Merkava V: Upgraded Merkava with commanders M230LF RWS mounted on the turret, distributed aperture EO for "see through hull" type situational awareness, select vehicles have a 5th crewman jump-seat in the "tunnel" with a couple of small unmanned aircraft that can be operated under armor (similar in size to DJI Mavic with stabilized 4K day camera interchangable with stabilized FLIR Boson 640 for night) 30 min flight times.
-Namer 40 CTA: Namer equipped with non-deck penetrating RWS with splinter protection (similar to the RWS in the previous post). 40mm CTA / Spike-LR.
-Merkava SPG (A re-imagined Sholef, as described earlier in this thread by others). This would have to be almost a complete redesign rather than simply slapping the PzH-2000 turret onto a Merkava hull, but it would use the same components as the Merkava IV / Namer for commonality of parts. Much lighter (~50 t vs 70 t) since you don't need all that extra armor for the role.
-Merkava SPH-TUSK: This is a short-barreled 155mm (similar to original M109 short-barrel) on a heavily armored Merkava IV Chassis. This will be expected to travel with the Merkava and Namer and so it's similarly protected, and it's short barrel helps in military operations in urban terrain where it's used for obstacle reduction / direct fire, but it also fills the role of short ranged indirect fire support for heavy mechanized forces (similar role as 120mm mortar, which it overmatches in range by several KM despite it's short barrel). Secondary armament includes an RWS
-Namer Command and Namer Ambulance: Similar to the Namer, but with an even higher roof for additional internal room (RWS)
-Merkava SPG Resupply Vehicle: Same role and function as the ammo resupply variant for the PzH2000, but based on Merkava components.
-Namer FiST: Forward Observer variant, equipped with additional radios, mast mounted EO package that can be elevated, RWS, and Spike NLOS missiles (25km range), as well as small unmanned aircraft (Hybrid Electric Quad / 2 hour Endurance)
-Namer Heavy Recovery (with RWS)
-Namer Assault Breacher: Mine Plow, Excavator arm, Mine Clearing Line Charges, RWS
-Merkava IV Scissor Bridge
Trophy APS and M230LF RWS / Spike-LR / Directional UAV countermeasures and VIRSS Smoke Dischargers across the board for anything expected to fight.