These are cockpit textures I made for the 787. Might release some for the 788. 

Simple installation: Drag and drop the file into the community and Enjoy:)

If it doesn't work by just dragging the file into the community folder just go into the textures folder for this addon and copy these into the textures folder of the 787 in the onestore folder. Paste and replace : 787_10_COCKPIT_TEXTS1_EMIS.TIF  ,  787_10_COCKPIT_TEXTS1_ALBD.TIF  ,   787_10_COCKPIT_PEDESTAL_ALBD.PNG  ,  787_10_COCKPIT_OVERHEAD_ALBD.PNG   ,    787_10_COCKPIT_MAINPANEL_ALBD.PNG