1) "Arilou are from *above*. Orz are from *below*." What the hell is this supposed to mean?
I've always took this to mean that Quasi-space and Orz-space are in two opposite directions along the fourth spatial axis, the one which crosses dimensions. True-space and Hyperspace are between. Since there's a portal from Hyperspace to Quasi-space, I assume these two are adjacent, meaning Quasi-space is on top, followed by Hyperspace, then True-space, and finally, Orz-space on the bottom. It's also worth noting that the Orz are fish-creatures.
2) "We seek to trap *Nggn*, but they dart and leap. YOU cannot catch *Nggn*, do not even try. I don't think you are quite solid enough." What the hell is this supposed to mean?
This one is just too weird. I suppose the best chance anyone has of making sense of what the Arilou say here is to figure out what "solid" means, perhaps based off the use of slippery, sticky, and other such Orz words, then think about what it would have to do with trapping something. Then from there speculate on what a *Nggn* could be.
3) Can anyone make a good translation of the Orz language, of the best terms to use for the terms in their lingual best-fits?
I try to interpret their *special* words as literally as possible. For example, fingers reaching into our dimension makes sense. Not being extradimensional beings, we don't have a word for what exactly the Orz said; the translator just picked the closest English word to what the Orz said.
Also, it is pretty clear that "dancing" refers to combat. From the Orz's perspective it probably really is closer to dancing, as they don't seem to have a concept of death, and if you blow up one of their ships, you're only attacking their *fingers*.
4) What ARE the Orz? The way they talk, it seems like they are actually one single entity that somehow projects multiple selves in our dimension ("I am Orz. I am one with many *fingers* My *fingers* spread into *heavy space*, etc. etc.). And what the hell DID they do with the Androsynth?
That's my interpretation of fingers as well. One single entity with many 4D cylindrical *fingers* intersecting 3D space appears in 3D to be multiple spheres, or *many bubbles*.
5) On the topic of Orz language, what do you think they mean when they say that the Taalo are playing *time tricks* on them in *pretty space*?
It's "time jokes." It probably has something to do with the Taalo's extinction.
6) What does it mean when the Orz say that the Arilou are always *jumping in front*?
It sounds like it means the Arilou are intervening. And as far as we know, us humans are the only ones the Arilou are protecting, which means the Orz are trying to get us.
7) Again, what DID happen to the Androsynth? Why did they look up information about ghosts and poltergiests on their computers when recearching dimensional fatigue?
There seem to be several indications that the Orz got them. Since they're gone, it is entirely possible they're still alive in the Orz dimension.
The Arilou tell you of beings where simply knowing of them is dangerous because it allows them to *smell* you, and it sounds like the Orz are those beings. That explains the Androsynths' fate.
It makes me wonder why the Orz don't want you asking about the Androsynth, though. If it was something other than the Orz that did it, then the Orz wouldn't want you telling them about the Androsynth because that would put them at risk.
I guess it could also be that the Orz saw the Androsynth, and tried to pick them up out of our dimension, which killed them. This made the Orz sad (they broke their new toy) and they don't want to be reminded of it.