I'm looking to run some electrical & CAT5 in my place as well as potentially some larger projects such as removing some partition walls. As a precursor to this I decided to model my house in Sketchup to get a better idea where things are and what's structural vs not.
I'm stuck on trying to figure out how the stairs are framed and what's supporting them at the split in my side-split. I've attached a few views of my plans so far. There are two sets from the ground floor to the 1st floor (red), and one from the 1st floor to the upstairs (purple).
I was hoping someone could help me figure out how the floor joists might be laid out on the 2nd floor. I've been able to determine the direction of them as indicated by the green and blue lines.
I've also put my best guess at what it might be at the bottom. Perhaps someone could comment on whether or not this is realistic.