You'll need a proper project plan and try and figure out what modelling & texturing resources you need as early as possible. You'd need to make sure that only original content, skyrim content, and modded skyrim content is used in the mod. You can't use models or textures from previous games, and you also can't modify resources from other games and then include them, however you can use old content for inspiration and reference. Whenever a new model or texture is submitted, there needs to be a procedure for making sure it's original, ripped from another game, and not just Oblivion content that's modified a bit. Splitting the map into grid cells and assigning them to people is not an effective way to divide the work. Everyone has a different patten when placing resources so things would look very disjointed. It would be better to split the map into much larger sections, then have people go through in various passes (rock pass, waterfall pass, tree pass, mushroom pass, flower pass, QA, etc). The group can focus on a region at a time and keep the quality high. ZER0777's ideas are similar to my ideas on where to go with a Cyrodiil mod. If the development this mod is well planned and supported, and would work well with mods for other regions then you can count me in. I've got 3dmodelling, texturing, programming experience, a lot of time spent in oblivion's world editor, plus I'm British so I can do some voice acting if required.