I ditto the question to Hilleberg re: Lighter materials. I have made my own mesh/silnylon inner tent for three season use in our Nallo 2 and it ROCKS. The traditional inner is just too hot and lacking in ventilation for a lot of the year. Not to mention the coller inner is 300 grams lighter...

A second vent at the top of the back pole (just like the front vent) would also be a nice addition to ventilation, as long as it could be closed off when not needed. This is my next DIY Nallo project, but would be a good option for commercial production for the non-diyers.