ya man, keep going. just make a ite version to start with.
drop factions that havent been worken on a lot, make them rebels or remove them.
make a smaler map maybe even. for example a map like in viking invasion or viking invasion + france germany poland

drop all the details that are not implemented and put them on hold for a possible later release etc.

any single part of this mod is great...if only a quarter of the originally plans are realized in a first release it will be still something i wait for.

try to combine work with crusader,medieval and byzantinum total war..and the baltic crusades or any mod that fits into the time frame roughly