Hello I just did about 10 hrs of research there are VERY IMPORTANT precautions you need to take! First and foremost would be the type of wood- Pine is readily available BUT IT'S TOXIC to sugars.Douglas Fir is a perfect wood! Next is dimensions- They say you need taller vs. wider however a great combination of both is ideal. For example the one I just built is 6ft tall 4ft wide and 6 ft deep Why the extra length? Because I found that gliders can glide over 150 ft in the wild and for me 36 inches is just cruel. So my Glider (seeking a mate) has Plenty of room to play and exercise. Also vertical climbing apparatus is very important- Climbing ropes.
Next is the wire I have found many of the coated wire is toxic for them. I used 1/2" by 1/2" opening wire. ( you will need to use white vinegar and water to remove excess zinc from the wire.)Contact me if you need a diagram for construction.
I don't know it all but this is what I learned. Hope it helps...