I'm the same, finished everything else - excepting the dee dee transport, because I can't seem to find a small engine in the mines for the life of me.
I had thought that maybe there'd be a spider creature in the cave on Amber Island that would drop the spider web, but that isn't the case. I can't find it either. Unless it's a reward for some quest or an extremely rare drop from some creature, I don't think it's in the game yet; similar to how you can make the dee dee car, but not actually use it yet.
Here's hoping for 1.1! I can't wait.