G, keep in mind this whole thing is based on a pic I saw some time ago that I can no longer find, combined with what I think "might" actually be found on an IDF tank in the very near future.
The commander's cupola is actually fictional, and has attached a Remote Weapons Station, straight off a Stryker. I based my creation on actual IDF enlarged "dog house" style cupolas seen on Centurion and T55-based ICV and engineer vehicles, designed to give full, all-around vision to the vehicle commander and providing some measure of protection. I used the standard Merkava hatch on top of it to make it look plausible.
The device at the rear of the turret is the Droid, Laser Warning System, which is actually in use by the IDF on actual vehicles, commonly seen in pics. Its function is covered very nicely by Rob.
And the first time I saw a wire cutter on a vehicle was a pic of a jeep, sometime in WW2, probably in Germany, as a counter to wire strung across a road as a booby trap. The function of mine is more to keep power lines and other cabling from fouling the RWS.