Nothing wrong with cross platform development though most of us here on this board are currently working on other projects so our assistance would be minimal. I don't have NWN2 nor NWN1, but I have been eyeing them for some time now. I might get NWN2, but I still have several games I just purchased that I haven't even beat yet. NWN2 might actually be a good idea for a game to mod for beginners or those who want fast results, but a lot of us see it as too limited for use by more advanced programmers, which is what this community tends to consist mostly from.
I don't doudt that NWN2 would make great atmosphere and the fact that it uses a storyteller multiplayer system makes it very tempting, but the NWN world is purely (A)D&D by design. I am skeptical whether a WoD system can be implimented without hitting into major walls.