Freely hanging loft bed 150x315

[Echo42]

So to facilitate my temporary lack of space, I will put up a loft bed.

I have two options where I assume one will work, but I'm curious if you think the other one will hold. Everything is shown in the pictures. I will prop up 170x45mm on three walls, where 40cm of 150cm on one wall is free-hanging. I plan to add steel brackets for support and, of course, L-puzzle the slats. I have a tiled stove that I will build around and keep about 5cm away from the stove, it is quite well-insulated and we rarely use it, so there's no danger except that it's a bit in the way. Finally, it's the longest beam of 315cm that will be free-hanging. There will be spaced battens as slats for the bed and plasterboard/thin MDF underneath as a "ceiling" to set spotlights in, and I will probably put some steel brackets for the battens too. It is brick in all the walls.
A 140 bed will go up and as you can see, there will be a little extra space as a bedside table and or seating area. So preferably, it should support 3 people.

And lastly, do you think 6x90 wood screws are sufficient for mounting?

Thanks in advance!

The pictures are by no means to scale.


Of course, there is also a slat on the short piece in the first one

 

[corre]

It holds without any problems. Use nail angles in the corners and screw the studs with wood screws. Feel free to use 45*70 instead of battens in between, so you can lay chipboard and any floor of your choice on top of this later.