I’m still a bit confused with fSpy, but I’m confident I’ll grasp it eventually.
By the way, do you happen to know why, when I have two vanishing points, my lines appear connected like a plane? It doesn’t seem to be the case in the video I watched.
Also just to add, when selecting edges to follow, the longest edge you can find is better than picking short edges, which will lead to errors for camera position… so in this example, you should pick the Long edge for the Right guide like you did for the Left guide…
Also, add in the Grid Floor…that will set the origin point for you to model from. Try to pick a corner of an upright edge that touches the floor area…