First of all, I wouldn't use the judges at Dixon's as a measuring stick for what's "good" and what isn't, and I don't mean that in a disparaging way. It's just that judging can be so subjective.
You're absolutely correct about originals having less bulk than most contemporary guns. That point was really driven home to me this weekend when I had an opportunity to see the Klette rifle first hand. All the photos' I've ever seen of the rifle left me with an impression that it was rather "robust", especially through the lock panels, wrist and butt. That ain't the case, at least to my eye. I wouldn't say it was "delicate" by any stretch, but it certainly wasn't "robust", at least not as I pictured it in my eye.
I tend to think many who build contemporary guns, build contemporary guns. I guess I'd describe it as a class of it's own, a continuation and evolution of building longrifles and fowlers. I don't think we should be happy with tomato stakes, but there's a lot of guys who can pull off a really nice looking contemporary rifle / fowler that is a little more robust than what you would typically see with originals.
So what to do? Personally, I don't think you can go wrong by studying an original any time you get the chance, and do your best to emulate their "look". You may not pull it off, at least right away, but I'd bet you're going down the correct road to building a nice piece, even if it is a little more robust than an original.
Ed