My 2 cents:
- properly forked github repo, so the differences from the base coin could be easily audited
May not be so easy to properly fork if borrowing several features from several coins, though if there is some base, then it should be obvious from which revision of what it is the fork.
It would be always nice to have something better that git repo with single commit "First released coin version".
- working testnet
How many alt coins have currently a working testnet?