There's 16 (if I remember correctly) door skins in the default Source engine texture assets. Most of them are distinct. Do you have those metal doors found in the backstage areas? Or the white ones in the labs? Why not taking a stab in the dark with the blue doors? And are the pushbar doors included?
Ok I took a look at some more doors in the portal games and have updated it, what do you mean by pushbar doors?