1) actually, that was a mistake on my part. The move should have ended with Susanoo. Lol My bad!
2)
While initially the Susano can grant a protection against most A-Rank attacks, in its final version, it can defend the user against most attacks regardless of rank and nature and has a physical strength enough to rival anything from Tsunade's top physical strength to that of a Bijuu. However, the user can still be attacked if, by using a tangible attack/element, the opponent manages to remove Madara from inside his Susanoo, by manipulating the substance in which the user is standing or by "entering" Susanoo from an exposed side (if he isn't complete). Not only that but the user is still vulnerable to Genjutsu, Sound, Light and the Susanoo itself can be cancelled if overpowered.
Basically, you need to attack the Susannoo with something that can bypass it. Example is to manipulate the ground in which Madara is standing for example. Other than that, what you need to understand with this technique is that you cannot simply "defeat it". You need to restrict its movements, hit it strong so it can stumble about and keep it occupied and basically "outlast" it. Also, you shouldn't forget, Susanoo is chakra. Techniques that are strong to chakra based techniques will still work. Example is Dust Release, Meiton, Bijuu techniques, etc. It has a forbidden rank strength against most attacks but its still not invincible. If you have bios like Nagato facing you, or even obito, things like preta or deva path abilities as well as kamui for example, will still work on it and either cancel it or overpower it or send it to another place. You can also restrict Susanoo in place by techniques such as Senpo: Myojimon. Amaterasu will weaken it severely and some of the attacks we saw can cancel it. Tsunade can produce punches in her modes that surpass Forbidden Rank power so she can break it. EIG the same. Illusions will easily affect Madara and with the Rinnegan active for example, he is vulnerable to those. Sound is the perfect counter though. If you use a sound hindering technique you can even make him release the susanoo. As for how to force the user to release it, anything that will produce big pain, damage, distress, etc can make the user release it. Taking control of his mind/body as well. Personally, I'd either wait it out since you can easily survive the attacks of Susanoo or try to attack madara before it completes. Or, If I was really feeling bad ass, make 2 clones, do a triple S-Rank elemental blast and obliterate Susanoo from around Madara. Though, in essence, you'll always need an ability of the same level of power and speciality to deal effectively with it. Its not something you can easioly survive if you have a simple, non special, non KG bio with only basic skills. But that was never the point of it.
3) well, in theory yes. Remember though that the full size is not as big in our RP as it is in the Manga. We assume its more or less bijuu size, perhaps slightly smaller. Mainly because as you know, our ranges are messed up to work with those scales. Short ir 5 meters, mid is 5 from 15... Madara being 200+ meter tall makes him encompass all of the battle field and leaves no way to attack or suvive. I«d say his max size susanoo has less bulk but the same height as the Kyubi.
4) One arm = partially called upon, full body = fully called upon. Stabilizing and letting it complete is different. The moment its called as a full warrior, you can only keep it active 6 turns (2 incomplete, 4 complete).
5) yes. its 6 (2+4)
6) same as other techniques. If it counters something of the same power, it disperses and ends. If not, you can sustain it and so it can be recalled with full strength in the next turn.
7) Susanoo can do the handseals but you need to focuss the chakra. The warrior is an extention of yourself. He is you. So, the usage of making the handseals serves if for example, your engaged in Taijutsu or someone prevented you from moving. You can do the handseals using susanoo. However, you cannot be molding your chakra for another technique and use susanoo to make the handseals.
8) The moment you leave from inside it, it begings to fade and it begins to "end". If you don't return in one turn, it ends. From the outside, you cannot control it. It becomes a construct of chakra which is inanimate and begins to fade. The fading takes time but it will still happen.
9) As long as its not special elements with special relations towards chakra. Example is Wood, Bijuu techniques, Dust Release, Sage Jutsu or Sage Empowered jutsu, etc. Those interact with chakra differently than other elements. The blades can counter same rank lighting fire or wind if they are big enough to do it. For example, I don't agree it can be used to counter a Fire Majestic Anihilation or a Fire Destruction. The scale would mean the blade would not serve to block any significant part of it.