excellent work and a nice sneak peek at Phitt's Sheogorad
Some issues - I killed the Immortal outside the airship. When he gets back up he has the [I HAVE NO GREETING] text associated with SI, ...
That shouldn?t be caused by the plugin. I guess (or better, I?m convinced) that you have left Shivering Isles by an other way but the genuine SI-gate (may be by teleportation or through a door added by an other plugin or even by a console command). And I fear, that the Skyship-Immortal is now not the only NPC in your (save)game with that bug. To cure that problem just reenter SI and leave it through the genuine portal.
But your description gives me something to think about - using the ship (calling it) while staying on SI is untested and I guess that the immortal will have there a similar "problem" (but then without any harm to the quest).
ALso, you may want to remove the part that sorts nirnroots in the ingredient sorter. Currently, if the player retrieves the nirnroots the nirnroot count will increase again (since they're technically different from the one the player sorted).
That?s something I haven?t thought at. But causes the raising number of retrieved Nirnroots any problems?
If not, I?d prefer to keep it as it is.
.....but how exactly do i start the quest?
The quest will start automatically (you will be contacted by a man).