Qae Shena
Super Shaper Puppy!
I'd say for the most part you wouldn't. If you wanted something specific beyond basics, you'd need a tech sub. I'd sub the custom ammo anyway to be on the safe side as you don't see SW mentions of explosive arrows - list everything you've got in a single tech entry. Even if it's mentioned in the arrow article (linked here), you may do things differently, and since the article is so vague, you'd probably need to anyway.