Even though I'm still a long way from actually building Lulu out of paper, it's important to already be thinking about it.
When you try to imagine how you can unfold the polygons you make in your head and how you can cut out and glue them together out of paper, you can spot big problem areas very early in the process.
At first, this sounds difficult to do perhaps, but as you make and build more and more papercraft models, it becomes easier.
In this case, with all these pieces coming together in the same place, I wanted to avoid the "hollow shell syndrome" because it would mean having to make a lot of difficult folds on some very small/thin parts...
Of course there are probably some more smaller problems that I may not have noticed yet, but that's what the test build is for. ;o)
But still, you probably want to avoid having to do *everything* all over again when you're already that far... ;o)
So try to plan ahead as much as you can, and have fun!