for example, my customized skin's lua looks like this:
livery = {
{"A-10C_PAINT_1-a", 0 ,"a-10c_47th fs_1-a_152",true};
{"A-10C_PAINT_1-b", 0 ,"a-10c_47th fs_1-b",true};
{"A-10C_PAINT_1-c", 0 ,"A-10C_47th FS_1-c",true};
{"A-10C_PAINT_1-d", 0 ,"A-10C_47th FS_1-d",true};
{"A-10C_PAINT_1-e", 0 ,"A-10C_47th FS_1-e",true};
{"A-10C_PAINT_1-f", 0 ,"A-10C_47th FS_1-f",true};
{"A-10C_PAINT_1-g", 0 ,"A-10C_47th FS_1-g",true};
{"A-10C_PAINT_1-h", 0 ,"a-10c_47th fs_1-h_152",true};
{"A-10C_PAINT_1-i", 0 ,"A-10C_47th FS_1-i",true};
{"A-10C_PAINT_1-j", 0 ,"A-10C_47th FS_1-j",true};
{"A-10C_PAINT_1-k", 0 ,"A-10C_47th FS_1-k",true};
{"A-10C_PAINT_1-L", 0 ,"A-10C_47th FS_1-L",true};
{"A-10_Number", 0 ,"TactNumbers-USAF-Light_black",true};
{"A-10_Number_Noze_F", 0 ,"empty",true};
{"A-10_Number_Noze_T", 0 ,"TactNumbers-USAF-Light_black",true};
{"A-10_Number_Wheel", 0 ,"empty",true};
{"pilot_a10_body", 0 ,"A-10CPilot_47thFS_Backbone", true};
{"pilot_a10_helmet", 0 , "helmet_camo", true};
{"pilot_F15_patch", 0 ,"patches_47thFS",true};
{"pilot_F15_00_body", 0 ,"pilot_f15_00_a",true};
{"pilot_F15_00_helmet", 0 ,"helmet_camo",true}
}
countries = {"USA"}
and you need your customized pilot_F15_00_helmet and pilot_F15_00_body files to be in your bazar\temp textures as well.