True, the model does have full launch bay section, and numbers are restricted. I, personally, wouldn't mind it for the Navy, but if Admech could still use it without restriction, they could reach Tau level of ordnance saturation. With better Ld for effective reloading. Scary.
So while 4 bays could be tested [i know i will], it would probably require restricting Defiant numbers for Mechanicus.