dj, as far as making it more challenging, I'm finding just trying to finish on time is more than enough challenge for me.
(refer to CBP 3).
I do agree, though, that trying to stimulate some more conversation and interaction with these builds would be a good thing. Maybe even just suggesting that participants list stuff like paints, techniques, glues used, etc may increase the interaction in the thread. I know for myself, a lot of the techniques I use I don't even think as techniques anymore because they are so natural to me. I think that we all tend to forget that just because we do something one way doesn't mean that others do it that way or that others even know how to do something a certain way.
The problem with increasing the 'difficulty' level is that you will start to alienate some people due to cost factor, skill level, etc., although with the participants we've had so far I don't know if that would really be a factor. Anyway, I too would like to see some more discussion in the thread. Let's see if anyone else has any ideas.
Ray