You just need to redo what you have just painted over with your new logos and lines.....just as you painted out the logos etc on the different channels, just replace them layer by layer to build up the correct speccoc. Thought it would be obvious you would need to put your own logos etc back as a replacement.i suggest you take a look to this thread -> http://www.racedepartment.com/forum/threads/how-to-create-speccoc-files.57953/
that video is just explain about blank specocc. not 'bout making proper specocc itself.