I thank you all for your information.
Malcolm, you seem quite creative in finding alternative ideas to solve problems. I have also been looking at alternative materials for the construction of the interior. materials research is one of my interests in my work. I have put the added challenge on myself to build an interior that also has minimal off-gassing.
Right now it looks like I will probably be building with sheet metals and aluminum framing to accomplish both parameters of off-gassing and lightness.
I am still wondering what weight savings I will be able to accomplish. By the looks of things, not much but the effort I think will yield an interesting look for the interior.