I want to dedicate 5 years to make NWN as a IE Campaign Mod for BG. Where do I start?

As the title says. I've wanted to get into modding for so long but never really had the time or motivation for it. My largest dissapointment around Neverwinter Nights is how detatched it feels from Baldur's Gate gameplay and I am interested in dedicating years to learn how to go about adapting the scenario to an IE game and eventually do so.

What are the recomendations on how to learn the modding scene from scratch and whether anybody would actually be interested in the idea.

Is it feasible? Should I begin my mad quest? (Has it already happened?!)