» Thu Jun 21, 2012 3:50 pm
To the best of my knowledge, you can't activate the 3D view via existing in-built functionality. On the other hand, the code to view the game's 3D models is clearly present in the Flash/Scaleform UI layer. So what you're talking about isn't impossible...just difficult, although easier if you're familiar with Flash and Actionscript: you could probably take large portions of code from the inventory and loading screen functionality. You might also need to work with the SKSE team to find some way of actually triggering the view (this seems like it could be a useful feature to have, independent of auction functionality).
I don't have much in the way of alternative suggestions, as I've never been to an auction or used MMOs that have them. I do find that often good ideas can come from working creatively within the limitations of the game's systems...if the best alternative is teleporting a horse on-stage, then maybe the auction house employs a mage for just that purpose?
Edit: I was thinking of something like your chest idea, too; it would work for smaller items, but not for things like your horse example, I don't think.