Day 3:
So far we have 2 scenes worth of dialog, and after some tweaking, I got the destination selection working:
You can now cycle through the stars displayed to pick where you want to go.
It doesn't seem like much, because I also had to program stuff behind the scenes yesterday to get this working.
Just like I was thinking, this project might be too ambitious, or the timeframe too short, to complete it. I still have to figure out a little story, write quite a few dialogs, implement other star maps, and create a proper story progression tree, before this prototype is complete. I hope I'll be able to make it in time...