The only issue I see is the impossibility of having Bakker involved. It might be able to set up basic stuff without garnering too much attention from lawyers - t-shirts, bumper stickers, posters, etc. We could probably host it on our server and link it through this site.
Something more complex, like the physical constructs you are suggesting (which sound awesome!) almost necessarily would need to involve laywers, rights purchasing, etc. More money up front plus soon as Overlook and Bakker get involved, I'd guess things would grind to a screeching halt.
But that won't stop the dream! I'm not a big figurine guy, or nicknaks of any kind, but I'd venture to say that you are right - there's great imagery in the books, we just need to find the creative types to turn it into reality.
Warhammer 40k: Earwa Edition

.