Yup, and those three all look alike, right? They're basically entry level for first timers.

Each class will usually have about the same airfoils as well. What do you want to do with your design? Thermal off a histart? Slope?

The one class that might still be fluid for design is probably HotLiner. Since the climb is mostly a function of power, the planform won't hurt if you diverge some. And since nobody has really nailed down what "required elements" to fly on the dive........... Have at it.

It's funny, but when I was doing cross country a buddy asked what was the most important design consideration for that. After thinking awhile, I told him the most important design feature was "BIG". Get the sucker big enough and everything else will work good enough and be of relatively minor importance. So cross country is also somewhat open to different design details.... after the BIG one.