There are over 90 Airstream dealerships that would love to turn a unit with virtually no costs involved.
Any dealer unwilling to change a future "on order unit with build date slotted" to your specifications (even from a bare bones Bambi 16 to a Classic 30) should not get your business.
You would be buying a unit that was going to be stock and require floor planning and sales effort and now would be a sold unit with no effort on their part other than filling out the change order.
In June 2013, we ordered a Classic 27FB with a specific future build date specified six months out to January 2014. We then changed the length to a Classic model 30. Then, for an up charge of $450, we swapped the linoleum from the Classic wood look to the International Serenity flooring we liked in our 25FB and added an aluminum backsplash behind the bathroom sink versus the usual wall "fuzz".
Ask to see the factory list price build sheet for the model of interest and then think outside the box on things you might like. As an example, there are no twin bed Internationals shown in the price sheet, but one was build anyway to a special order.
You can always ask and the factory can always decline. Nothing ventured, nothing gained.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels