I'm talking about a safe, structurally sound, functional and durable cubby house, not just 3 panels of plywood nailed to a tree.
I see pretty nice 2nd hand ones for sale on marketplace sometimes, and wondered whether it would be much trouble to build one.
Thanks
Don't go with Metricon. lol
Speak with your local council in relation to permits needed for larger cubby structures. Each council has different requirements. Some councils have relaxed rules where as some other councils have strict guidelines.