I think you may struggle to move it, even with wheels fitted, over anything other than solid ground or a very level well mown lawn, but I think they are an excellent idea for providing a secure penned space. I also think getting a goat is a great idea. You can perhaps let the chicken and goat...
I'm so sorry for your loss. :hugs
I did think your statement about there being no predators was a little naïve as chickens are prey to pretty much everything and wherever you live there is usually some predator that likes chicken, even if they are just domestic dogs, so there is always a risk...
As someone who has Marek's in their flock I can sympathise. I knew as soon as I read that Susete had one eye half closed what was coming. So many people miss such a subtle sign of it or don't think anything of it, so you did well to spot it at that early stage.
I'm not convinced that the problem...