2-3-2 is the transition a droid going from 2 legged mode to extending his 3rd leg and tilting and back again. in the movies this was never really done by a real droid. only ever saw him go from 2 -> 3, and if you saw 3 -> 2 it was probably the film being played in reverse. The droid the was used for the 2->3 transition pretty much shook himself apart int he process.
The term I am using for my droid is R2-D2 “Uber” 2.0, as he is the next generation of my 1st droid (R2 1.0). He will do the complete 2-3-2 transition. In the dome I have mobile holoprojectors, lifeform scanner, periscope, and all doors and panels opening. In the body he will have all his doors opening, I have sets of CPU arms (the ones that come out and spin as he interfaces with other computer), I have the grasping arm as seen the empire (MGA), There is also the body zapper (though I doubt I will get it to fit with the 2-3-2 mechanism). There is plans for the magnetic grappler that comes out the back, ala EPIII when R2 drags C3Po’s head around. I should be able to get that one in. I do have models for the Zapper in the dome, but it is not easy to articulate and will most likely be an attachment I can plug on. Same goes for the drink tray. I have plans for that and a PVC version, but am working on getting it made in wood. I also have plans I am working on for a new version of the drink tray.and the dispenser. So all this… hence the “uber” call sign. I have extra domes for and R3, R4, R5, and i am working on plans for a R6. I have more R2 domes. The completed one I have came off a group run where one was used for EPIII. The new R2 dome I am working on matches more with the original trilogy. More domes means I can change the droid’s look quickly if need be.
The models are done the Rhino3D v5. The animation is using Bongo 2.0 and the raytracer is Flamingo nXt. Those are older videos and I was still testing the raytracer. Bong just came out of beta.