I think the way to go with a renovation would be to take it back to Airstream in Jackson Center and let them make all the upgrades. If you look at the interior of the new AS Classic trailer, they could almost duplicate that for all the interior upgrades and appliances. For the mechanicals, take it back to Freightliner in Greer, SC and let them put in new dash and assorted upgrades.
Think of it as rebuilding a Chris Craft yacht...
I have been looking into options that might dress up the exterior by adding an aluminum skin to the lower level compartments. Would give it a look kinda like the last big diesel aluminum RV they sold in 1994.
I agree with the height problems....makes them top heavy and difficult to manage in cross winds.