Making the craft yourself is not at all difficult. For the playground, it will serve as a decoration, if painted in bright colors. Children generally love all kinds of equipment, and here is such an unusual table with benches.
Questions arise when choosing materials for crafts. It is clear that children want to do everything as best as possible, better. So that it was safe, and practical, and pleased the children with their appearance. I would like the construction to serve at least a few years.
Based on all these considerations, it is advised to use plywood for the machine itself not thinner than 200 mm, and make benches and a table from boards. Fasten everything with screws and epoxy glue. Then the whole structure will turn out to be quite stable.