Just to clarify, it is (AFAIK) only the jettison part of attachments that is not working in SC
Most 3D programs have the Z and Y axis, -x and +x swapped in relation to Orbiter, I don't know if this is the case with Anim8tor, there are exceptions.
SC and VB are very similar, I learned by converting SC vessels and "taking apart" the example .cfgs
As
gattispilot said it has an ingame menu, so you can play around and see what happens (not all features work correctly though), your best references are the SC doc. and the Orbiter API docs (OrbiterSDK folder).
It is, unfortuneately, partly uncharted terrain, but the best is to get started and if you get stuck, ask, I for one would be happy to assist and look forward to seeing your creations in Orbiter!