I'm working in a super tight spot with a cement foundation wall, a doorway and floor joists in the way, so I needed to offset the bathtub trap about a foot using long 90 degree 1 1/2" elbows. I have it dry venting 45 degrees out of a cutout in the foundation wall, because I don't think venting horizontally about 10 inches is allowed. So, does this look okay? Would there be a better method to do this? Any advice would be appreciated.