Whats the best 6-8 bird tractor, with separate run, two piece.

[dsklapatch]

Starting back with chickens, I had them before, but work made me travel so by by buddies.
I want to start again, re-purposed pallets, raised tractor style, but leave it as two peaces, run and coop. 6-8 bird maybe. Any ideas??

 

[Cyprus]

Here are articles made by other members on tractors that they built. You might be able to get some ideas from there.
https://www.backyardchickens.com/articles/category/tractor-coops.17/