Question building technique

[Juroen]

Anybody got an idea on below green traced tile, how this is done? I’m not sure if this tile is split in 6-7 studs or full length 10-12 studs.

 For the tile on the right I already have a modified square tile with 2 studs on top.

[zux]

From this limited views I would assume parts are held purely by gravity and are not attached to each of two sides. One of those 4 non-hatched plates could be Plate 2 x 2 Corner, just to keep it from sliding.

Speaking of length of that tile. It is hard to tell from a single blurry picture. My assumption is that this is made of two parts, one of which is attached from below.

Again, this is purely speculation, as given information is very limited.