I did just found this website website though:
describing some glider designs by a guy who believes he has built some
useful structural protection into them.

There's a world of difference between a 22 MPH landing in an ultralight
glider and a landing at 3 times that speed in an airplane.

Homebuilding prominently includes accepting additional risks to gain
certain perceived advantages. If risk minimization is your goal,
homebuilding is very much the hard way to achieve it.

Ed Wischmeyer