If you are talking about "Garden Betty",
DON'T DO IT.
If your questiuon truly is "Has anyone done it"? regarding *almost anything* to do with chickens, the answer is YES! and as
@Lazy J Farms Feed & Hay suggests above, a quick use of the Search engine will demonstrate the veracity of my claim.
Now, the questions you didn't ask...
Can you save money making your own feed? Probably not. Particularly for the typical backyard flock.
Can you make a nutritionally superior feed at similar price point to whatever target niche need you have (Organic, Soy-Free, Gluten-free, non-GMO, Vegan, etc)? Probably not. Particularly for the typical backyard flock, with the knowledge of a typical backyard owner.
Is Protein the only thing you need to worry about? ABSOLUTELY NOT.
Are there people here in BYC who will help me if I want to go down this road anyways? Yes - though the more they know about feeding birds, the less likely they are to recommend you embark on doing it.
Get yourself a bag of All Flock/Flock Raiser crumble from one of the big commercial companies (Purena, Nutrena, etc), feed all your birds that, all of their lives, regardless of gender, age, or whether or not they are currently laying or in molt. Have a seperate dish of oyster shell available, free choice, and a similar dish of grit. Keep plenty of fresh clean water on hand for them. Problem solved.