This slow speed capability and their strength helps gliders to survive very well. Gliders are a little easier to build than powered airplanes. They don't have engines so you don't need to install that or a motor mount, gas tank, cowling and throttle control. The only landing gear to install is some form of skid and this eliminates more building work. Installing a tow hook is something you will have to do that you wouldn't need on a powered airplane.
Gliders have small fuselages and radio installation can be more difficult.
It is best to build gliders carefully to keep weight low and strength high. Gliders don't require fuel or starting equipment but you will need to invest in a high start or winch to launch them with. Glider pilots also need to do a lot of walking to get the launch line after each flight. This is generally only required for finding thermal lift on flat ground. Another aspect and class of glider flying is in finding lift on a slope.