I'm modifying 2d ani, not the 3d ani you have in the upper right corner. I'll also modify the one I used for missilles (won't be very used since 3dship/model selection hide them)
I prefer people using my mod to use 3dmodel/ship selection because I don't have the whole 2d models for all my ships and I don't know how to make them

(same for shields anis, if anyone know, please answer this topic)
you can open a fs2 mission file with wordpad

even if it's still better editing them in FRED2 to avoid many problems
but to do this you'd have to unpack the vp file modify the missions and repack them (in zip or rar) when sending them to me
EDIT : looks like quite okay for me :

I tried not to use 3d model ship selection and just noticed two of my ship are using the selection model of the hercules

, now I need to find how to make ani of ships with the model