We built a cardboard telescope ourselves. We were quite impressed at how sturdy it is once it was pieced together. The cardboard shapes and cutouts were well designed and form a very solid structure. It took a while for a nice clear night to come along, but once it did we got the telescope out and set it up in our conservatory. Being a clear night in Winter, it was very cold, so we faced it out the door and tried to keep as warm as possible.