Small shed - wall construction for render

[MP1]

Hello,

 

I am constructing a small shed (3.5m x 2.2m) that will be used only for storage. I want to render the external walls with the K-Rend silicone render to match my outbuilding and my house. I was wondering if you could help me understand what the best way to construct the shed is so that it does not cost a lot and can be rendered. My ideas:

 

- wooden frame + OSD (not sure how easy it is to render over it)

- wooden frame + cement board (seems like the way to go)

- blocks (seems like a lot more work and expense) 

 

any suggestions would be very much appreciated.