Ah, I figured we would come to this at some point. Renderform, to me, toes the line between "garage kit" and a full-fledged 3rd Party company close enough to be in the database. Plus, as it's already been mentioned, one of the requisites should at least be the fact that it's sold or has been sold through the usual online retailer channels.
So I believe we should leave these types of items out of the database for now, at least. I mean, I would love to add things like Trent's awesome Battle Beat items through Shapeways, SkyQuake's awesome IncrediPlugs used for CW to Energon figure interaction, heck even Cheetimus' insanely cool custom figures, but that's not technically what we have come to call "3rd Party", at least not yet. As 3D printing technology becomes more easily, affordable, and available to consumers, we are bound to reach a point where your average joe will be able to easily mass produce items such as these and sell it on a website set up through Squarespace or something similar.
--SoS