With regards to reverse conversion of SOD based models. You have a few options:
1) The MS3d plugin for Milkshape. It will open STOCK models ONLY. This means it won't import 3rd party models in any way shape or form. There is a special version of this plugin which a bare handful of people (me not included), actually have.
2) Lithium UVMapper. Free program which is fairly hard to come by. Opens all Armada 1 model files but not Armada 2.
3) Ultimate Unwrap 3d. Will import around 98% of all Armada based models, but needs to be registered to allow saving/exporting.
Hope that helps.