You could always ask me instead of asking indirectly, if you want the models. I'm quite happy about sharing something that isn't going to be used, as long as the person acknowledges the fact that I made it, and credit is given where credit is due... That's only fair, isn't it?
If your intention is using the models for Tremulous, even by editing them and using them as a basis for your own work, you ask for my explicit permission first.
However, the CONCEPTS aren't mine, they're Psylo's, so you can remodel them, if you so see fit.