i have applied graphics to small aircraft, helicopters, and 747's i can GUARANTEE you this...the average sign shop could not do to the job. not because some of them do not have the skills they simply could not get the approval to do the job, pay for the insurance, inspections, etc., etc., etc....
i have seen in house graphics departments that quite honestly run 3 shifts a day and can barely keep up with production...there are situations that the average sign shop simply can not service.
i have seen in house graphics departments who can not meet their own requirements and are forced to use any and every sign company that they can find that can squeeze in extra work at almost any price (within reason).
these scenarios can lead to big opportunities on many levels, from overflow work, supply and equipment sales, to potential job leads, the list could go on forever...there is some very short sighted thinking taking place.
if you think the average sign company is prepared to do all of the branding for a national brand simply put I have NEVER seen it work.. i have seen it tried more than once. i have seen parts of it work...but never the whole kittenkaboodle.