1. Is there another site with SoaSE forums that is active?
2. Why is there not a model showroom?
3. Are people creating models?
4. Is SoaSE as "mod/model friendly" as Howmeworld Franchise?
Thanks Dan the Man!
1. I don't know about other sites... I think you can find anything you want in this community. There are many helpful modders.
2. Showroom for the existing meshes, that are in the games? I read about copyright matters, if I'm not wrong, and that's the reason, why isn't any official converter (form mesh to xsi...) But you can find posts about home-made converters, just use the forumsearch.
3. Yes, there are many teams making new models for the game, check the Danman's other topic, the Star Trek, the Star Gate and all post which has more than hundred replies 
4. Yes, it's mod friendly, you can change almost everything as you wish. I don't know much about modelling and Homeworld. But there are topics for modelling, you can ask there. I think it should be "model friendly", because there are new models for the game 