SPORE models
My son has made some models in spore that are very purposely reminescent of Hexen models. They aren't perfect but then again they do add something that the originals are missing. It is a work in progress and I will post some vids later. Spore models can now be exported in Collada format, so if they can be converted to something that Deng can use it may be pretty cool.
Comments
I gotta admit, I played spore and i'm a little skeptical... the Creator always seems pretty sandboxed aand not too flexible... or did I just suck at it? Haha
I don't know how flexible it is, as I haven't tried it, but here are some funny videos of creatures made for Doom and one for Hexen:
http://www.youtube.com/watch?v=Y_fc8ridWu8
http://www.youtube.com/watch?v=CTRgo2u3tRk
http://www.youtube.com/watch?v=27Rx9vcdxuY
http://www.youtube.com/watch?v=Dwv6ZaibVGY
The Cacodemon and Mancubus especially are decently-accurate, but nothing you'd want to use in-game