I want to write the story of FNAF 4 too. I got this idea today while walking home. It supposed to be a shorter one, much shorter, and it will be told be the older brother, more years after it happened.
And I should start the comics too but it will be such horrible amount of work (and I'm really afraid that the results won't be as good as I want them to be), I'm afraid to start it ^^'
Also the opening page will contain environment pictures, which are my weak point. I'm reading Scott McClouds comics about how to make comics as inspiration. If you haven't met those books but you are interested in making comics, or just love reading them, I highly recommand them. They are entertaining and very useful.
I know I was making a Kiriban months ago but I think will only chose the winner around Christmas ^^' Sorry for that!