I was hoping to complete the MOD this weekend. Unfortunately, (and fortunately), with the aggressive work on AE, the Final Release of ExP is going to be delayed. As soon as we start closing in on the final app for the server AE, I will finalize the work on ExP.
As it is no secret now, an MD5 check is being made on files within the install folder. Other files within the folder are also being considered among those files that will be checked. ALL original textures and sounds will be intact (and must be), so that any person who has the MOD and joins an unmodded server, but is running AE, will be seeing, hearing and using the same things that anyone without the MOD would see, hear or use. The added files must work, because the final check ' will be what it is ' - and will or will not fly.
I, for one, am glad to sacrifice having the final MOD available, to make sure that we are all playing fair. I will keep you updated. I apologize for the delay, but I think it is a good trade-off.