Grammar: まだ何も書いてあっていない？

So I was trying to create a placeholder introductory post, and I wanted to write that "nothing is written here yet", and I ran into a grammar issue. I was going to try まだ何も書いてあっていない—but can I conjugate 書いてある like that?

• 書く kaku, write


• もう書いた mou kaita, already wrote/written


• まだ書いていない mada kaiteinai, not yet written, still haven't written


• 書いてある kaitearu, written by no one specified


• 何かが書いてある nanika ga kaitearu, something is written [here, by someone unspecified]


• 何も書いてない nanimo kaitenai, nothing is written [here, by anyone]


• もう何か書いてあった　mou nanika kaiteatta, something was already written here


• まだ何も書いてあっていない mada nanimo kaiteatteinai, nothing's been written here yet

正しいかなあああ。。。正しくなければ、直してください。