Though there are some parts that aren't even covered in the manual. Maybe they're mentioned, but I can't read japanese.
So, what are all those flesh colored parts for? Some look like adapters for armor parts, and I think those would look better in the armor's color :/
And then the flesh rings. Maybe to extend limbs?

There are also some dark blue parts, one being that very useful backplate. But there's no official build using it in the manual.
Not to mention the runner of flesh colored parts

I've heard of adapters to use MMS1 parts with MMS3 bodies... Maybe some of these are that.
I also suspect that since Sharatang and Baby Razz are a duo, some of these are used to combine their armors, like other duos', though I couldn't find a single pic or mention of such possibility.
I've also read about features present in the Shinkis because they're also in the games, but the manual fails to mention that (or people fail to notice the manual mentioning it or it's only written and it went unread).
Is it common for Shinkis to come with extra parts to encourage custom kitbashing? Or do all of these actually have a purpose in an official build?
You can see my Busou Shinki wishlist in here. If you know where to get any (with wishability 5 or 4 for now) at decent prices, please do tell, as I've yet to find a surefire place to purchase BS.