Hi, Since the first "bad" day of the vacation arrived today, the beach will wait and work on the children's room upstairs has begun. The house was built in 1921, has a gambrel roof, and there are attic spaces on both sides, but not where the stairs come up. I want to tear down part of the wall to make the room slightly larger and let the window in the attic become part of the room. I have now removed the shiplap boards on the attic side and emptied all the sawdust to get a good view of how it looks. Below is an attached picture. Attic room under renovation with exposed wooden beams and arrows pointing to structural elements; sunlight through a window highlights a broom and a sack.

I thought there would be a support beam from all the roof trusses down to between the floor joists, but as the red arrow shows, there is a board at the bottom and similarly at the top, and as the green arrow shows, there are upright planks here and there. The first after 2m, the second after 1.5m, and then another after 1m where the door will be. I can understand that the wall is in some way load-bearing, but since I want a floor at the same level, the board on the floor is in the way. The upright plank could remain. The question is whether the board on the floor must stay to distribute the load, or can a floor beam take the entire load? The roof currently has sheet metal; it used to have roof tiles at one time, and the absence of these has lightened the roof considerably. The existing wall will be moved about 1m, and support can be placed at each roof truss, and insulation will be added, so I will need to extend the roof trusses with a 95 board. Do you think I can remove the horizontal board? Or is there another way to distribute the load? Thanks in advance.
 
With the risk of talking about things where one should be very careful, and I don't know much, I wonder why there is a large notch in the standing plank between the green-arrow plank and the snow shovel. It doesn't seem to have been treated as a load-bearing beam directly.

If it is a load-bearing rule along the floor, one might wonder what it rests on. Is it possible to distribute the weight from above in another way? Perhaps widen the rule and make it lower.
 
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