We tried to keep our build as transparent as possible this year. We even posted a video which you could literally use as a template for your entire robot, if you paused in the right places.
At the risk of over-posting this,
here it is.
Given, our robot follows a very conventional design, and it's pretty low-budget. If our team had ambitions that were a bit more unique, though, we would be happy to show them off too.
It's not really in any team's best interest to keep a design away from others. If they do so, they may inspire a slew of copiers (but probably not);
or they may gain valuable insight from teams with more experience, so that they can find out what works and what doesn't as soon as possible. Maybe the top 25 teams should try to keep their designs secret. But there are over 1,800 other teams active right now, and every single one of them could likely benefit from another team's advice.
Just my $0.02.