Taking models that are in a mod and convert them to Sins. TO be more specific, taking the ships from SST 1st Insterstellar War, and putting them in Sins. TO use for my own purposes, unless if I'm told I can release it.
Well, odd mod to ask this question in... but lucky for you I've already had some experience with this working with Rebelmoon in this very regard.
The short answer is maybe. You'll need a way to convert the ALO files into something you can import into Softimage XSI.
Once converted you'll have to fix the models as they aren't really compatible with Sins of a Solar Empire. This is one reason I backed off making a starship troopers mod for Soase because more work was involved than I wanted to take on.
So, give it a try if your capable. The results might end up pretty cool.