For the first 50, your lines are very clean, with very little arcing present in the set. Your convergences also show good accuracy, though I did see a few lines pair off and converge towards two vanishing points, like [box 3's green lines](), box 22's blue lines, and box 49's red lines.

For the next 50, your lines remain clean throughout the set. As before, I notcied few instances of arcing. Your convergences also show improvement. I did see a few more instances of lines pairing off, like box 54's green lines, box 73's blue lines, and box 100's blue lines. However, they were less frequent than before.

For the last 150, your lines remain clean and even throughout the rest of the challenge, demonstrating very good technique and consistency. Your convergences also continue to improve. I did see a few instances of lines pairing off, like box 107's green lines, box 179's red lines, and box 223's blue lines. However, since they continue to grow less frequent, I don't think it's a major concern. Still, this diagram may be useful to you. Keeping in mind the angles of neighboring lines can help when planning the box's construction.

As an aside, some of your boxes are missing some line extensions: box 8, box 14, and box 134. It's not a major issue since it didn't happen often, but I want to point it out for future reference.

All said, you did well. I'm going to mark this challenge as complete.