I am sure that there are many reasons floating around on why GW does not want to do a plastic Thunderhawk Gunship, and this morning an inside source has chimed in on the subject.
Apparently the margins to make the model profitable are not enough to get one released. That simply could be on assumptions on how many would sell, and how much it would take to get it onto the market. Would I buy one? I'm not sure.
via anonymous source on Faeit 212
there is no plastic thunderhawk as the margins aren't sufficient at this point in time to make it worthwhile.
However, it seems something big will coincide with an upcoming Apocalypse release.