Okay, some progress and some more snags.
Progress:

I skipped ahead and, editing the Artemis's table, got it working in-game. I find that, compared to modeling and texturing, tabling and balance should be a breeze.
Also, I've started work on a new missile which I'll release with the Ammit, the GVM Khepri:

The Khepri is a dumbfire torpedo, designed to be fired at point-blank range by an after-burnering Ammit.
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But, as usual, I've been having some more problems.
First, I'm moving slowly on the texture. My texturing skills are unimpressive, as I've never actually textured anything before, and I think my finished product will be rather mediocre compared to other people's recent models. I'll post an update when I have something worth posting.
Also, I'm having trouble getting the textures on my models to appear in-game, even once I've finally gotten them to work on my POF. That's because the Ammit's .DAE which I exported, and then turned into a .POF, was reading its textures from the texture files which I had copied over into the models folder of my test mod when I exported it (not the textures folder). So, even though PCS can read the textures, FSO can't, and so my textures aren't appearing in-game. How do you make sure that the .POF uses textures from the textures folder?