I'm a little surprised at the choice of netting on the bottom. I would prefer Cuben or Silnylon. I think both give you much better strength (including puncture resistance) per weight. 0.7 oz Cuben (or the closest weight to it) is much stronger than Nanoseeum. It is also not going to "grab" (see the mesh vs. smooth pocket discussion). One little root sticking out of the ground and I'll have a puncture in my tent when I stretch it out (unless I'm really careful). I guess I can use a ground sheet, but then why not make the bottom of the tent out of the ground sheet material?
In general, though, I really like the fact that folks are making more Cuben/Nanoseeum tents. I know the Cuben is expensive, but I think it is worth it. This is exciting.
With regards to double walled tents: I agree that with the lowered weight of materials, that double walled tents are definitely worth revisiting. Many of the so called single walled tents were almost hybrid double walls. The big difference, like Nia mentioned, is that you couldn't take the roof off. That's why favorite design is still the Luxe Rocket X. For much of the tent, it is double walled (especially the upper body, where most of the condensation originates) but it saves some weight by not being completely double walled. If that baby was made out of Cuben and Nanoseeum, it would probably be extremely light.