We used to have these setup all round temporary military installations. Not sure how long they last outside though, never stayed at one longer than 4 months.
Here is a DIY one made of wood. Looks quite sturdy. It is kinda portable. Look near the end of the vid. Here is another one, made of much more (thicker) lumber. Not as elegant as the first one. Maybe not as 'portable'.
I think it's just the matter of which paint you use, to get the wood it weatherproof. Here is one using the A-frame concept of the first one, but with galvanised scaffolding material.
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