Hello FSDT,
Houston's George Bush Intercontinental Airport is a large international carrier that has airlines from all over the world visiting it. KIAH is a much needed airport in the FS community because there isn't any other add-on developers that have released one. Simflyers is very out of date and is at the time when construction was still going on. There is a freeware scenery available, but in my opinion KIAH is not correct if it doesn't have the taxiway bridges, the proper ground textures, etc...Do you have this in mind for future projects? You need to at least consider it.