ok in the game u have to save the default skin of the aircraft you want to do.
then go in to the program files and find HTC then aces high 2 open that foulder and you will find a list of sub folders.Now find the folder marked skins and open it,u should have a yellow folder with the name of the aicraft u want to do e.g spit 9
Now make a new folder and name it spit91 .
to get the bitmap of the origional open the spit 9 folder then highlight the skin copy and then paste it into the new folder e.g spit 91
also copy the material file.
now u can close the folders and u are ready to strat no the skin.
depending what u use i use psp8 i then open up psp hit browese and find the htc folder then look for the folder u just created.
once found click on it to open it and then yu find the skin and can start.
what do u mean by concept? taking bits from some one elses skins? or a idea for a skin that some one has posted?