I have finally read the Plot Outline and the edited story and I think it's brilliant!!
Just one thought, the Quidditch season hasn't started in the story yet, while it is supposed to have started already. Maybe one of the Quidditch matches could take place on Halloween seeing how not much happened, but, if you still want to have Philip "ignorant" and to have never seen a Quidditch match, perhaps it could be interrupted(or is thta too much COS-like), because they can't find Lockhart anywhere. And maybe they find him in the Forbidden Forest in the end.
Oh and just a little bit about the scene where the adults are stuck in the Great Hall(which is a really ingenious idea), maybe the students could try to send owls, before thinking of the kitchen-solution, but of course the owls can't enter, because the blocking charm works on the windows too. This isn't really important, but sometimes while reading you get these ideas like, "Why didn't they try this or that?" so if in future, other people are going to read this, putting that idea as an impossible-solution would help to clarify some stuff. :/
To be honest, I thought it more fitting if Jacobson were sent to Azkaban. That would also blow his cover on the story which Gerry was telling James back at the World Cup. Personally, I don't think Lockhart is capable of doing something really bad like that, unless Jacobson was perhaps using the Imperius Curse on him.
This is just my idea. I don't want to seem like I'm ruining the plot or anything because it's absolutely amazing and I know how much you all must have worked hard to get it all set.
And by the way, I was teaming with Italy throughout the whole Quidditch Match.
<a href="http://www.projectferret.org"><img src="http://img.photobucket.com/albums/v403/cherise_22mt/Computer-Made%20Drawings/ferret.jpg"></a>