Hmm that seems odd, so you recommend an APS-C camera over full frame? There may well be good reasons for this but in general, full frame sensors seem to be the preferred choice.
The real thing to do here before you even consider what airframe you are going to aim at is to sort out the camera you are going to use and to do that you must work out what sort of photography you want to take and how this fits into the business plan otherwise you will end up with the tail wagging the dog so to speak. In so doing you may well end up finding that an APS-C equipped camera is the one to go for, in which case great.
Work out the work or end result that you require and then find a camera that delivers. Get the camera sorted first and then come back and ask for recommendations for airframes etc would be my advice.