What type of board on the outside of the wall?

[Genvägen]

Hello
I'm thinking about building a playhouse using loose timber.
The plan is for it to have a plastered look.
I saw that the JABO Ambjörnarp shed has some panels that are reinforced with fiberglass strips in the corners and then painted with textured plaster paint.
Help me. Which panels should I choose and which strips and texture agents do you think are needed for my project?
Minerit or wet room panels might be an alternative. I would prefer a cheap option since it's a playhouse.
What do you think?

 

[Malten]

There is plaster intended for exterior use, which is much cheaper than wet room plaster. However, I am not sure if you can just paint directly on that surface, or if they are meant to have paneling or something similar on them. I'm sure someone more knowledgeable can answer, or you can check with the building supply store about what is applicable for exterior plaster.

 

[andersmc]

If you're thinking of exterior gypsum, despite its name, it is not intended to be mounted outside. It sits inside the wall, behind the paneling. It can withstand a little rain for a short time, but definitely not for permanent outdoor use. It is also, like regular gypsum, quite fragile. The surface is coated with something wax-like, so it's also difficult to get paint to adhere.

To the question: I would go with regular construction plywood.

I'll pass on the color and texture...