I can’t speak to the backend or the ease of prepping models for use with it, etc but as somebody who’s spent a lot of time designing interfaces, Sketchfab is one of the first times I’ve seen presenting 3D models online actually working well. I’m a big fan of how well it seems to work for the end-user and I think it would be well worth exploring. The navigation is easy, works well, and it’s pretty resilient to lower speed connections with how things stream in progressively.
I think something else that might be handy is thinking about ways to encourage our user base to show examples of putting marketplace content to work in their projects. I’m not sure how you’d curate this exactly but seeing videos of the assets in action can really help in making a purchase decision. Of course for the content creators themselves, adding video content to their product pages would be really helpful as well.
Steam has to solve similar problems in the steam store (describing digital goods at a high-ish price point to the consumer) and video is a huge component in making this possible.