Welcome to the forums. What era Airstream are you considering? The 50's are all aluminum inside and you can strip off the paint and polish or replace the existing skin with new, since they are all flat panels, even the end caps. In the 60's the interior end caps were make of plastic, but you could remove them and put in flat aluminum panels also. JCFerguson has replaced the aluminum skin with plywood, use the search button to find his thread.
Bill Kerfoot, WBCCI/VAC/CAC/El Camino Real Unit #5223
Just my personal opinion
1973 Dodge W200 PowerWagon, 1977 Lincoln Continental, 2014 Dodge Durango
1979 23' Safari, and 1954 29' Double Door Liner Orange, CA