Here are a set of blueprints for a mobile poultry processing unit (MPPU) built to operate under "equal to" state inspection in Vermont. The MPPU was built by the Vermont Agency of Agriculture, with funding from the Vermont Legislature and the Castanea Foundation, in 2008. It was leased by a small poultry processor for several years, then sold to a farm in January 2012. For more details and background, read the full case study here.
This is just one set of blueprints from one MPPU, and other designs should be considered. However, this is the first and only MPPU designed to operate under "equal to" state inspection, meaning that this design should work under federal (USDA) inspection also.
Please note that the blueprints do NOT show four important elements/additions: