I was wondering if anyone has used the plans from a 4-page set of PDFs available online called "Hutches for rabbits" apparently by the USDA from 1972? You can find them by searching "rabbit hutch" and "6137" (the plan number) through Google. While I see a few areas for improvement if it was to be used for individual rabbits, it has quite a few good ideas in general. It shows details for underfloor nest boxes and a rather simple but effective door latch. I think I'll spend a little time using Sketchup to model variations of it.
Nathan
Nathan