Repainting: how paint doors

[flyingpinguin 0]

Hi,

 

I made a new livery. I got the full fuselage painter, except the doors. I dried to scale the doors, by copy and paste and resize along the green line of the uv-Map. But it doesn't fit it to the Livery of fuselage. 

 

Is there any trick, like a formula, how to solve this problem?

 

I work with the newest GIMP. 

 

Thanks for your answers.