Yes, it is possible.
Quite a few things to learn, though...

Breakdown:
For the actual quests, you will need to get eternitys Quest importer from here and learn how to use it and eternitys x2qs scripting language. Info can be found here, here, here and in the example quest in eternitys tools thread (where you got the importer).
For cutscenes within the quests, you'll need to learn bev (cutscenes with dialogue boxes) and/or dem (mostly animated cutscenes). Made a walkthrough/guide/thingy about bev that may help with that, but I don't have more than a cursory understanding of dem and I don't think there's any documentation on it, so I can't help with that.
Then to integrate everything into the lobby, you'll need to learn tsd and tsr scripting (and to a lesser degree tnl). Made some documentation on tsr, but it's not complete yet. I plan on doing some tutorials on tsd, tsr and tnl in the future, but I don't know when I'll get to that.

Also take a look at this mod by former_modder.
If you are still interested and need help with some specifics, I highly recommend coming to the Citadel discord server.