Hi Burr - re: n-sided patch - that hole you've got in the blue one I don't think is feasible to fill with n-sided patch since it's got that pointy part that's kind of sticking up 90 degrees away from the side loop part. That's kind of too much variation within a single patch to fit very well.

N-Sided patch basically starts with a plane and then squishes points on that plane up or down until it is deformed to fit the outline. But with that much variation the outline there will be difficult to fit to.

I don't think you can put a smooth single surface in that spot - I think it needs to have a ridge down the middle of it to match with the sharp point on the other side.

Something more like put a line down the middle of it and then patch each side separately, see attachment.

- Michael