Should the intersection determine the layout of the wall? For Wall 2, I was interested in creating an interference pattern between the two layers. Maybe I should have made sure the number of bricks was the same as the roof, like I did for Wall 1. Instead, I found I had to make a flat surface before joining the roof to the wall, because the courses didn't line up. For this, I used some bricks sliced lengthwise before firing. Also, I used some half-bricks to finish the roof in the same pattern.
When I was mortaring the sun came out and I realized that I liked the shadow line that I get on the roof bricks when the joint is slightly recessed. So I went back over them all again!