Does page 12 imply that there are three artists working on this? Do they mean assistants? Because if there's actually like fifteen different fucking artists working on this no wonder the proportions and style is all over the place.
そうですか > そっすか probably.
The japanese are so lazy that they slur literally everything they say.
and as for アレのそっちにあるソレ, the most i can make of it is
"that (distant) that is there (distant), here (near)"
So like "That over there, here." maybe. When you just sound it out it sounds like someone...