Aligning a curve on box sides so the 4th side lines up

[bbowers12]

I have 4 box sides. I want to make a curve shaped that lines up on all corners when the box is assembled. The first 3 corners are no issue. Is there some easy way to align the 4 corner of the curve shape. Think of these as mitered corners that will fold up. I have attached a picture.

[Adrian]

You could use a horizontal guide and snap each end to it.

[Jozua]

Is there some easy way to align the 4 corner of the curve shape

You can also go into node edit. Select the two end nodes and click "Y" on the keyboard.

[martin54]

The other thing you need to take into acount is how you are going to cut the 4 pieces, are you looking to us a v bit & box fold or a straight endmill & cut into 4 seperate pieces? Either way there is going to be a bit of hand finishing for each corner, the thicker the material you are using the more you are going to have to clean up