Risk, house ruled, for a Dun Kells campaign war

I am getting ready to run a play-by-post game over at "ThePerilousDreamer's" new forum that discusses Campaigns and House Rules for OD&D.

I am psyched. It will be at the highest level, "campaign level warfare." The players will act in the persons of the characters who will be the monarchs of each major kingdom: Byzantia, Germania, Iberica, Gallica, Logres and Slavia. I will be working on rolling up around level 10 characters for each of those roles and sharing them with the players soon. Above is my "map" for this game. I designed it in a more abstract, "London Underground Map" style to make connections clear and because I am no artist. I think it is usable.

The main game mechanic will be that of Risk combined with a kind of Diplomacy-style of play. Players will publicly announce publicity and "spin" from their monarchs on the public boards. They will negotiate treaties and trades by PMs (that include me as ref). They will issue orders for each of the main phases of play to me, simultaneously, by PM.

So, the main play phases will be:
1. Negotiate and trade
2. Reinforce
3. Attack
4. Fortify

They will only know what their armies immediately hold and immediately neighbor. They will have to trust what their fellow players tell them or send out spies for any other knowledge. I will keep campaign level accounts vague for that reason.

For reinforements, they will get one army for every two realms they control, rounded down, never less than two. They will get "kingdom" bonuses when they control every realm in a given kingdom: 2 for Iberica, 4 for Byzantia, 3 for the rest. I will call "territory cards," "trophies." The trophies for victories will be three different resources: wisdom, power and wealth. They can turn these in for 1 more army the first time, and these will increase by one each time resources are turned in. They may trade these during the negotiation phase.

I still have to work out how attacks will need to be worded, as they will be resolved, simultaneous, by me as referee. I still need to work out fortification, but I will allow formal allies to fortify one another.

I am getting excited about this!