Years ago, a member of VAC used aluminum honeycomb flooring in an
Airstream he refurbished. It is the same stuff they use in aircraft
flooring. I am not sure the price. I may not want to know. I did a
search and here is what I found. Scroll donw to "Aluminium Honeycomb"
and click. I am not sure why they can't spell aluminum. The honeycomb
is light, very strong and resistant to rot, mold, etc.
http://www.panelprojects.com/honeycomb.htm
Enjoy,
Jerry Harris
2000 Diesel Excursion 4x4
1971 Tradewind 25 foot
1982 Silver Streak 33 foot