Coop moving day for the new coop is now within sight. My main man who recently had both wrists slashed for carpal tunnel syndrome is almost fully mended. Between him, myself, my eldest and one other the move should be quick and without damage to the bottom section.
I can then put down the nail bars and skirt, fit the door and that should keep everything out bar a pack of dogs. We'll have two lines of defense. The run fence which while a bit of a mess still works surprisingly well and at night the coop and extension which should be pretty difficult to get into.
I'm starting on the nail bars later this week at my eldests.
I'm consdering using the auto door I bought off ebay on the coop extension door when it's fitted. That will kill two rats with one lead shot so to speak.

The rats won't be able to get at the food unless the breach the skirt and nail bars assuming the auto door works okay.
Considering just about anything could have just walked through the run fence a few months ago and then climbed into the old coop as the door was never shut and the run didn't have a door this will be a massive security increase with benefits. As long as the pop door on the coop opens the chickens can get out of the coop and into the coop extension. While not ideal it will provide as much room as many of the almost ten square feet per bird in the run recommendation for what that's worth.