Calminian,
You're doing a good job of demonstrating the plasticity of YEC hermeneutics. In your opening statement, you said that "the bible writers avoided detailed descriptions of the structure of the universe." I've since cited several passages that detail the Hebrews' understanding of the universe that you acknowledge refer to the firmament (at least the one's I've taken the time to quote for you). Except, instead of interpreting them at face value, as YECs regularly insist upon, you simply chalk them up to phenomenal language (e.g., the Job passage), to symbolic language (e.g., the Genesis passages), or to vague visions that don't really mean anything (e.g., the Ezekiel passage). It appears, then, that what you initially meant to say was that the Bible does, in fact, describe the structure of the firmament in some detail, but that you simply don't accept those numerous, independent descriptions at face value.
That's fine. I also accept that the Bible's descriptions of the cosmos use a phenomenal language -- that is, I apply an accommodationist hermeneutic. The funny thing is that by accepting the same hermeneutic when it comes to Job's description of the firmament, for example, you open yourself up to the same criticism that YECs so often level against evolutionary creationists -- that is, by not reading the Bible using a concordist hermeneutic, you are not taking it seriously ("If we can't believe what Job says about the firmament, how can we believe what the rest of the Bible says?"). I expect I'll never hear that line from you. Interestingly, you also do away with many of the verses that YECs cite in support of scientific concordism (e.g., Job's description of a round earth [26:10] that hangs on nothing [26:7], the water cycle [26:8, 36:27-28], the division of light [38:24], etc.). I don't expect I'll ever hear you cite the first 39 chapters of Job in defense of scientific concordism, either.
I'll also point out that your interpretation of the firmament is inconsistent. In your last post you compared the firmament to the atmosphere that covers the earth like a canopy. Yet earlier, you said that the firmament encompasses the sun, moon, and stars, too. These do not occur within the earth's atmosphere. Your interpretation is not internally consistent.
Finally, for those interested, there's an excellent article about the meaning of the firmament by Bible scholar Denis Lamoureux here:
http://www.ualberta.ca/~dlamoure/heavens.pdf
He dispels many of the misconceptions Calminian has about the firmament, and examines the many biblical passages that describe it (as opposed to citing one passage repeatedly, as Calminian does). He also goes into some detail about the historical interpretation of the firmament.