I've only bought and made the Italeri and Zvezda Mil Mi-8 kits . The Zvezda kits give you the option of leaving the rear doors open . Both kits have raised and recessed/engraved panel lines , although the Zvezda kit detail was a lot better . I also have been curious about the Hobby Boss version , the Mil Mi-8 is my favourite non U.S. Helicopter .
Sorry I couldn't of been more help with your question , I hope someone else can offer more info on the Hobby Boss kit .
Kind regards John