Jees, who is bmeat? n whats with all the hate?
I guess I'll just answer the question...
The mix is fine.
Ideally you should not put only perlite in the bottom, this is what I've heard from many growers.
Though I'm on my 1st personal grow, I have had many successful "team grows", and remember having the same idea way back when, but quickly discovered this is a no-no, so have never done this.
Just make sure it's very well mixed, and if you can get some perlite on its own, get the ratio up to about 3 parts soil 1 part perlite minimum.
The more drainage the better (within reason), especially for auto-feed systems.
Zip