I have a part of which currently the planes are skewed:
Ideally, I would want planes like this:
With my current model I have difficulties as it has a curved surface on the edge:
What would be a good way to go about this? I tried adding reference planes by first drawing lines on the edges of the part, but the planes are still skewed. The part is a scanned object so there are some curves in the part that make it difficult I think.