There are some quite creative easy to fashion coops on the BYC 'chicken tractor gallery'
Have you taken a look? I like the plastic storage container with the plastic bucket nesting boxes.
http://home.centurytel.net/thecitychicken/
My first coop (which lasted about 1 year) had me bending down to collect eggs and clean out. Let me tell you, that gets really old really fast. I just bought a new coop off Craigslist by a local person who handmade it off his own design. It is tall and everything opens from the front. No more...