Just wanted to say how much I love your scenery! You mentioned looking at smaller airports due to the techniques you are using to create them. My sugestions would be Colorado Springs, Salt Lake City, KMSP, KOKC, KDAL (HUGE VATSIM Following with Southwest Virtual).
Or because they are smaller airports, maybe something like a Rokcy Mountain package with Colorado Springs, Aspen, and a few others. Being not a scenery designer myself, I do not know if the production time is related to the size of the airport. but if this is the case, maybe a package type deal of 2-3 smaller airports for the same price would make a great percieved value. Back in the days that Wilco Publlishing was creating the Airport scenery, I purchased it because it included several airports for a relitively low cost of $40 for multiple airports. Not comparing your work at all to theres, but monetarially, its the same issue.
I love the smaller regional airports like KMCI, KSTL, KMEM (okay its not that small) KIND, KDCA, KRDU, KCLT.
I guess my point is, if you do the smaller ones...maybe look at doing two at a time? Like KRDU and KCLT or KIAD, KDCA. Things that are pretty close in proximity.