mh i dont think, that your models will fit the standard quality of outerra-models. Did you see them? There were textured and they found the "smooth"-Button. I'm an obsessed blenderuser and so i know this business very well. The grasp of the knife is flat-shaded. Why? Probably you know, that your models are too highpoly for a gameengine.
Maybe this sounds too harsh, but dont take this personally. Its just critique for motivation. Train your modeling skills and of course your texturing skills. That means to create diffuse-, normal- and speculartextures for your models. That should be the minimum. Professional models are using also ambient occlusion - textures sometimes. If you understand these processes you are able to contribute models for game engines
Btw. i like your attitude about opensource media. Thats the right idea.