I'm working on a repaint of a 91C Safir, but I'm stuck at the moment.
Since it's a C model I'm trying to modify the panel of SE-KVZ so I can put in a couple of labels with the right registration.
Whatever I do goes completely wrong

Which bitmaps should I modify and which formats should they be saved in ?
I believe yo can see what I mean in this pic:

Here's a pic of what it might look like when it's finished, anyone interested?

Best regards,