The Fine Homebuilding asserts that these site-built cabinets do not violate the NEC.
Out west, we commonly use the "All-in-one" , where the meter, the main disconnect, and the branch circuit breakers are mounted in the same (internally partitioned) box.
While some say that these cabinets are OK, as long as the doors open at least 90 degrees, other opine that ANY such enclosure would violate working space requirements.
Any thoughts?