Valery
First of all - welcome to MM6 fans
1. I am a big fan of MM6, its the best game of MM series for me, and probably I like it stronger than all Heroes series...
I am discovering and extracting its resources already for a long time, and there were different thoughts about make some mod or project.
2. I think your idea is very interesting. It should turn out in big and complicate mod.
I support your thought about creation of some team for that mod. I will join to it with pleasure.
Sergroj is big fan of that game too, I think, he will support the developing of such project as well.
4. As that mod is expected to be massive and complicated enough, I think it is necessary to make certain disdoc, which will accurately describe the basic aspects of the MM6 mod.

I think (may be You mean exactly the same) that it will be more interesting, if MM6 mod will not recreate exactly all storyline and events of MM6 world, but all game mechanics, rules and e.t. It means will be some "gameplay platform", and every mapmaker will be able to create his map on that MM6 platform.

I extracted MM6 map too, tell me what is the problem with it and I will try to solve this problem.
I think that there will be possibility to make a very large map, one of WOG team members has already wrote some patch for it.