What I don't like on the general idea of Project Tamriel is that everyone with a bit of free time could work on a provience of his choice, no matter of his experiance and his skill, esspecially on Exteriors...if there is no showcase and quality standard and no administration that control everything, give detailed instruction how the terrain should look alike and makes critical reviews it will end up in a mess...I have doubts that there are enough skilled and experianced modder are out there to work on many proviences at the same time...but that's just my personal opinion, others may see it different.
I won't tell you how you should handle your project...just don't forget that quality work need motivated, skilled workers and not a noobie who can barely handle the Construction Set.