I love love LOVED the MHP so much we're doing it again in the spring...
We wouldn't be, but of the 5 chicks we got in May, 2 have died of bacterial infections due to yolk sacs that didn't pass - they were too young to start laying.

(14 weeks and 16 weeks)
We also lost a hen mid-summer due to reproductive cancer, and another just this morning is showing signs of EYP (which doesn't suprise me; I was waiting for this to happen with this particular hen).
So, our flock of 9 in May is a flock of 6 (now soon-to-be 5) and so we're looking again at getting chicks again. Here's my question:
In May we used a chunk of the old coop as our brooder, and it did MARVELOUSLY for 5 chicks. We tossed it though (not enough room to keep it around) and so now I'd like to do the same set-up... an in-run brooder that can be opened up with escape doors as they get older and start mitigating the run with the big girls. I have searched for pics here, but they're all indoor type brooders. I'm looking to build something that would go in the run, be safe from the big girls (and the occasional mouse that might wander in, yuck!). It's predator safe in the run. I'm thinking of buiilding a box from 1x1s and hardware cloth and figuring out some way to include escape hatches for when they get bigger. Also, I want it to be easy to clean out (of course) and access the food and water. Our run is completely covered but it is shorter than I am, so I stoop when I'm inside. This makes some things a little bit of a challenge, so I need to keep this in mind at the same time.
Has anyone built anything like this, and if so, do you have any pics? Easy and fast to build and store during the non-chick rearing times would also be a big plus.