Two funny adjectives (?) in Algerian Arabic

In Algerian Arabic, as in any other Arabic variety, adjectives follow the noun. However, there is one exception to this rule: invariant quja قوجا or qŭjna قُجنا, "a huge". Thus we say ṛajəl kbir راجل كبير "a big man", but quja ṛajəl قوجا راجل "a great big man". Not only does this "adjective" precede the noun it modifies, it requires it to be made indefinite: you can say šrit quja ktab شريت قوجا كتاب "I bought a huge book", but if you want to say "I bought the huge book", there's nothing you can do but use a different adjective. *šrit quja l-ktab or *šrit əl-quja ktab or *šrit əl-quja l-ktab are all impossible. You can make quja قوجا follow the noun, but you have to use a different construction, equally unique to this "adjective": ṛajəl quja mən huwwa راجل قوجا من هو "a great big man", daṛ quja mən hiyya دار قوجا من هي "a huge house". The origin of quja قوجا is clear: it comes from Turkish koca "large; husband", which in turn is apparently an early adaptation of Persian xɑje خواجه "master, gentleman". In Turkish, all adjectives are prenominal, so one could take that to explain its position in Algerian Arabic; but a quick search suggests that Turkish koca has no problem combining with the indefinite (one finds phrases like bu koca dünya "this huge world"). However, it looks like Algerian quja has followed a trajectory very similar to Iraqi and Khaliji xôš خوش. It is not obvious to me why obligatorily indefinite prenominal adjectives should even be possible in a language that otherwise strictly requires adjectives to be postposed, much less why they should have to be indefinite in order to stay prenominal - but that's what it looks like....

The word məskin مسكين "poor (pitiable)" is not so unusual, lexically speaking; it's just about pan-Arabic. It combines just fine with definite nouns, and takes normal agreement (f. məskina مسكينة, pl. msakən مساكن.) However, it has almost the opposite idiosyncrasy: it doesn't take the definite article, which would be obligatory with any normal adjective whose head is definite (and, if it comes to that, with a noun in apposition to a definite phrase as well). Thus we say bwəʕlam məskin maqdərš yji بوعلام مسكين ماقدرش يجي "poor Boualem couldn't come", even though we would say bwəʕlam əṭ-ṭwil بوعلام الطويل for "tall Boualem" (Boualem the-tall). Why? No idea. Suggestions are welcome!