I encourage you to experiment with different airfoil profile and different wing configurations! I've made this simple online customizer (https://www.sol75.com/component/glider_if) where you can easily change the main parameters and then download the modified STL. 

The frame is quick to print (a bit more than 1 hr, depending on the configuration) and usually quite robust. This was by design, so you can iterate more quickly! 

Print requires no draft or support material.