I just looked it up, without playing yet. It is a wonderful scenario and I am very sure I will play it with pleasure.
I'm a big Ultima fan, and for a long time had (and still have) the project to create an Ultima scenario for a PBEM game. The 8 virtues just fit into the 8 possible players (the Pirates would have to be removed) and the storyline could be the fight for power in Britannia after LB's death. I created a map, which looks a bit different like yours, by taking in account, that the tiles are twice as wide as high. My map looks distorted in the minimap view, but gives the proper geometry, yours looks properly in the minimap, but N-S distances measured in tiles are twice as long as W-E distances. I don't know, which principle is better.
By the way, I had the idea to give my LB and my Avatar the "tactical missile" flag and let the Golden Ankh transport 2 tactical missiles. This way the King and his Hero could travel in the King's ship (and only on it!). If the Golden Ankh gets killed, both are stuck whereever they are. This added a bit spice into the game. And I made spiders and giant squid as barbarians . But I left the work unfinished, not enough time.
I'll play your scenario within the next days. Thanks a lot for your work!