I would opt for a JA-17 Poultry Mobile. Think midget Conestoga Wagon for chickens!
Three sheets of plywood, some 2x4's, wire mesh and and a tarp - and some really cool innovations
Cantilever, stressed skin construction.
No Peck Egg Retrieval, from outside
Liquid Gold fertilizer generator.
Self closing doors
Stand up inside
one person moving on wheels!
Fresh air house
10 bird capacity
Use as brooder, greenhouse, tractor, storage
Part of a Permaculture Plan for longterm sustainable rotation
I built one some years ago and it lasted for 3 years, before I gave it to a friend - and it lasted 3 or 4 years with only his neglect.
With some maintenance and attention I'm betting 10 years would be doable.
I'll probably build another next year, now that Ive moved for the last time. I have a paddock area for the birds and the Poultry Mobile would be perfect.
Either that or a hoop house. But since Ive got the plans for the JA-17 (maybe the only ones left in the world, for all I know), its a no-brainer.