Regarding the upcoming Scenery Gateway. I think it should include a rather large library of textured buildings, terminals, hangars etc for Developers to use in their airports.
I think the library buildings should be white by default and Developers can:
Apply a color tint to make the texture that color. (building.color = #FF0000 - i.e. red)
Apply signage / wording to the buildings.
Tweak building parameters (such as siding or construction type (texture) etc)
Adjust the size parameters (length, width, height etc) IF possible.
By doing so, there can be custom buildings but the library size will be minimized.
Also just to add, some buildings may for instance have dual colors, for example light gray siding and a darker section at the front top panel. In that case, the Developers should be able to specify both colors to “tint” the texture.
It has to be done the right way like above to make flexible buildings for Developers but not grow the library size exponentially! It is much better to set some properties in a text file than be including thousands of extra textures in the library.
If you look at X Plane Gateway, it was a good idea, but all terminal buildings are the same boring gray color. There are no custom colors, custom signage, custom siding type etc.
I really don’t have a clue to what Scenery Gateway is at this point. Basically, it was originally intended to be the freeware marketplace by contributors like flightsim.to is. But the last two development updates, the description is about allowing users to enter in data updates to airports, etc. and that doesn’t even sound remotely like what it was originally. For PC, flightsim.to is basically what was originally suggested (the original request was shortly after launch of MSFS). But this was going to be the way for XBox and cloud users to bring in freeware. But with this latest description of what is being coded in the development blog, it looks to be more like a community data entry tool. Time will tell what it actually is going to be, because originally it was going to release in December but the contractor hired to develop it left, but the original estimate was it was going to be about a month of development. So I would expect whatever it is, it will be appearing in the sim in the next couple months (If I had to guess, Sim Update 9)