May I suggest you do 2 things: 1: Identify specific github tags to build for each variant of testnet, and 2: provide config details.
Also be aware that Dawn 2.x is deprecated so probably best not to spend effort spinning that up. Likewise the pending Dawn 3.0 RC1 release is going to be a hard fork, so be ready for that. If you really are tracking the master branch, expect plenty of do-overs between now and then.
We created a couple of weeks ago a testnet based on 14.02 build
Now we are testing master , already have a node running , but not yet a testnet