Keep it up! Never say die! This is going to be so fun!
Don't plan to let it die

Do you and your friend plan on doing this entire mod yourself?
No definately not. The problem is that we simply can't. We're svcky exterior designers. For example, the whole castle thing is going to be very hard to do, but we already have a plan for this. We're just hoping this person can find the time to help us.
As for the Ebonarm idea, I think this would be a way to enhance the mod to more than what you currently have going on for you. Perhaps as the Mythic Dawn begins the skirmishes in the cities of Cyrodiil, you begin to have the tale of Ebonarm's warriors unfold before you. You will see them in places, and cutscenes, etc. But you will not actually fight any of them until much later in the mod--perhaps after a few battles with the Empire. They could be very strong, with some kind of magical helmets or some sort, and all ebony armor (as a pun).
Yeah, that's pretty neat, we want the whole ebonarm thing to be a late-game thing, not early on. The shift of power, which obviously occurs in stages, will slowly trigger the awakening of the ebonarm faction.
But I think the epicness of this mod could be enhanced greatly if you decided to shift the focus onto another enemy. Fighting the Empire will be old stuff, and you could turn this into an amazing quest mod.
True, but the problem for us was basically the ES lore. We'd rather not break it completely or add new stuff, but rather blend in already excisting stuff. That's where the Ebonarm idea came from. It will definately not be entirely lorefriendly, but it should be believeable enough! Basically, in the early stages you will have to deal with the already excisting enemies such as the Empire, Blades etc. Greatly decreasing their opposition will cause a shift in power from those factions to the Mythic Dawn, which as I already mentioned will trigger the Ebonarm faction to respond.
As for your plan, I see a few details, but I think it might actually be a good idea to write everything out before-hand--all of the NPC's, the scenes you will include, everything. Then you could turn to other modders for help in implementing different stages of this product.
We have, for the most part. The only thing that isn't fully documented is the main quest, possible mini side quests and the ebonarm faction. I believe there was/is a link in the OP to the plan, although I'm not sure if it still works. I'll see that it's fixed if it doesn't work anymore

Of course, this all depends on how big you want this mod to be, but you might get a lot more support if you think of an entire plan--no matter how large it is.
Our plan mentions we needed a plan in order for the mod to ever see the light of day

If you have any needs for help on writing quests, or the mod, or cutscenes, etc., I would be willing to help. Heck, I'd write a novel on this if you wanted me to.
Take a look at the plan! the url should be in the first post (I'll make sure it's working as soon as I click the add reply" button to post this post).
EDIT: MegaUpload link still works, removing the Rapidshare one.
Just some suggestions for you. The bases look great, btw!
Thank you, I'm not sure if I should say this, but I think we're not bad at interior designing. If only our exterior design skills were that good

Some of you may have also noticed that I haven't been online lately, think nothing of it

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