Yes I did notice the similarity between the Sculptor and the Dock defender in "Matrix: Revolution" when I saw Matrix this weekend. I guess being a biped, similarities would also show up with the Alien Crane. However I think the Dock Defender seemed more like something out of Power Rangers style Mechanoid! I was inspired more by contemporary machinery like diggers etc. Left to me I would have designed the Matrix-defenders different. Have a mix of Missiles and Guns. Also make the bullets as micro nuclear ammo capable of small range EMP so that they could damage the circuitry of other sentinels in proximity. Making the defenders with biomechanical control would stop them from being affected by the Electro-magnetic pulse generated. In addition, exposing logistics (in this case ammo loading) to enemy fire is bad weapon system design. No doubt, the script would have to seek its dramatic quotient in some other manner, but showing teenagers as "cannon fodder" loaders to the defenders seemed like bad design. Considering what was being shown as a siege, fortifications and routes to replenishment would/should have been better designed, as no new attack-mechanism was being shown from the machine's end and thus there were no surprises per-se. Therefore such eventualities should have been accounted for. The attack was reminiscent of the Battle for Midway with ant-aircraft ack-acks fighting Kamikazes fighters. Well, now I'm in half a mind to create a defender of my own...which puts an idea...what if we had a mini-challenge of designing our own defender weapon system? :P Any takers? :)