We just got a couple of sheds (about 5 ft high, so just about standing up), and added a pophole and perches ourselves. Got dimensions from the Katie Thear books. Our nest boxes are just cheap plastic boxes, with one side cut out and a lid on, easier to clean and no red mite hiding in there.
Also creosoted the inside, and in particular the perches and where they connect to the walls.
Ours also got a light (a simple outside light fitting from B&Q) run on an extension and timer from our goatshed, for extending their day length in winter.
Fencing is electric netting, but we have our whole perimeter fencing on electric, run from mains charger. If you only have poultry and no other livestock that needs containing, that would be an expensive solution.
But we also built a coop from wire and blue (water) pipes, easy and used for youngstock and meatchickens. Moved every day when in use. If you have got someone who can build a henhouse or similar and you will need to move it regularly, wheels should be a good option. We have one that uses old buggy wheels (from a three wheeler buggy, not air inflated tyres though) and I can easily move it on my own. That one also has wire mesh, and is used mainly for meatchickens/surplus male stock. Saves on cleaning out. I am not that good with taking photos, though.