I'm in the process of building my second hutch. Basic design principle was solely as a support for wire cages and to protect from rain and wind, secondary design principle was to be aesthetically unobtrusive to my neighbors since we live in the city.
We're using a deep bedding system under the hutch to knock down the ammonia smell. We'll layer it, turn it and then move it to the compost once a month.
Plan is to build another one across from this one in the next few weeks.