Complicated Edge Blending

[VjLuper]

Hi beauties! I can't do this Edge Blending. Basically I have a texture to map on contiguous panels.
The portion of texture that goes on panel "4" is not rectangular.

So to be able to map it on the corresponding panel (which is curved) I first make it rectangular on a virtual output.

Then I map this virtual output on the panel.

From the left side I can do the softedge with panel three. But from the right side (in red) how do I do it?

[Zoltán]

Can you post a shot of how your current blending looks like with the test card on the screen?