If you paint the wings (which I thought could be done) and place the texture in the same folder as the rest of the repainted textures, then it will be used. The texture.cfg tells FSX to look in the other folders listed, for those textures that are NOT in the texture folder.

This is the contents of the CS_B727-100\texture.aa\texture.cfg:

[fltsim]

fallback.1=..\texture
fallback.2=..\texture\spec
fallback.3=..\texture\bump
fallback.4=..\texture\night
fallback.5=..\..\..\..\Scenery\Global\texture
fallback.6=..\..\..\..\..\..\Scenery\Global\texture

If the texture isn't in \texture.aa. It will look in the \texture folder. If not there, the \texture\spec etc....

If you repaint the wings (727_100_4_T.psd) and put them in the \texture folder, you would overwrite the original and then ALL the 727-100's will use the repainted wings.

As for the rest of your question, I can't answer that.

Hope this helps.

Mark