I am a classically trained trumpet player as well. If someone were looking for a trumpet player and I saw an ad for it, I'd first off want to know if there was any definite money involved (like putting together a band for a gig), I'd then want to know who I was working with. I'd want to know how they play and a little bit about them. I would want to know your age and gender because you do need to be able to relate and get along with the other band members.

Personally, your ad seems pretty intense to me. You state that this is exactly how you want things to go and this is how the politics of the group will be working and etc. I would make it much more casual. You're planning on making a band with other people and you'll have to be flexible. After reading that, I'd be worried that you would be a little bit controlling.

Maybe you could answer some other local ads to people just looking for a casual jam session. Maybe you could just start having casual jam sessions or go to local band concerts and talk to people including the band members. If there is a music school near you, post ads for jam sessions there. You can meet people through that and get a sense of people you can work with.