But, that's the hazard of having so many older birds around, I suppose. Hopefully we'll have a break from losses for a while, though I am still keeping an eye on Roha after how weak she was from those darn mites! Fortunately, they seem to have died down almost entirely already from that first treatment! 
Yeah, with the weather the way it's been lately, the mud has been ridiculous. I thankfully haven't noticed any major mud balls on mine so far. 
Thankfully, I never seem to have too much trouble with my Cochins keeping their feet clean!
Hopefully the dirty bum is a one-off and you don't have to keep cleaning him up! One of my Silkie roosters got a dirty butt recently when he'd never had that problem before in his life--and I definitely let him go to roost before dealing with that because he's a pain in the butt to grab! Definitely hear you on being overprotective. I know for a fact that several of mine can perch fine on their own, but every night I still put them up to roost anyway, just to make sure they find their way to bed properly. 
Marka passed away in the night after several days of exhibiting the exact same symptoms that her mother, Margaret, had had at the end, and at almost the exact same age that Margaret passed, 8 and a half. Marka was always a pretty low-key part of the flock, that is until last year when she was finally able to shine as the single best broody hen I have ever had raise chicks. Among several other hens who would forget their chicks or expect them to do way more than tiny day olds could ever do like hop all the way up to roost on their own, Marka was patient, gentle, calm, and fiercely protective of her babes. She taught them the best places to free-range, reliably warmed them and stayed with them when they were too small to get to some places, she helped them integrate smoothly into the flock, and she weaned them gently without terrorizing them or chasing them away so they were able to grow independent on their own time. I was so looking forward to letting her hatch to her heart's content this year, knowing that she would do an excellent job as before and not cause me worry over my 'grandchickens'. I'm filled with such regret that over the years, so many, many times, she wanted to brood, yet for various reasons I could not allow her to until just last year. 
I hope, now they've had some practice at it and to some extent seen Marka work her magic, that her nieces, Amaretto and Peanut Butter, can go on to shine this year as Marka did at rearing chicks. Here's hoping we're getting to the end of that now, though.
I did bring the two OEGB girls inside a couple nights ago, along with Gwenyth just to be safe since she decided to molt and is already half naked even when she is at full feathering. 
But everyone's still running around and acting like normal despite the temps, so I'm trying not to worry about them too much. I can't wait for this cold snap to end, though 
I'm not sure about the shed with no ventilation, these birds do put out a lot of moisture but if it's only two then they might be okay in there... But the 60° building probably would be fine as well. The room that I moved my birds to is about 55-60° right now and they seem okay with that.
