First year for the double door pipe-framed Whirlwind.  As noted below, interiors were fully customizable - and notice the price - $4000!!  That is $512,000 in 2006 dollars!  As a result, not too many were made, or then even survived due to the pipe-frame chassis.

To the left is one of few known surviving examples, residing now at the Airstream factory in Ohio, s/n 2008...