I did Boardman (M50), this airport creation tool is fairly easy to use, took about 20 minutes to create the airport with runways, taxiway lines, taxiway lights, and objects. I agree with Michael's feedback, as well as the others. If possible it would be nice to zoom in closer when marking the edges of the taxiways, and center taxiway line. If make a mistake drawing a line I haven't figured out how to delete just one point, I have to exit the program and add the line again.
I also did Portland (KPDX) when doing the crossing runway there were no errors when saving it, hopefully this has fixed the crossing runway issue from FSCP.
ApfelFlieger I tried importing a previously created airport, when it opens up on the map the runway doesn't line up, its off about 90 degrees.