[Trooper117]

They are both correct in my opinion.. The first 240 production aircraft had the fully enclosed cockpit with hood, (the mod version). The traditional 'hump' behind the pilot was initialy all perspex I believe.. Maybe someone with more knowledge could confirm that.
After requests from pilots, this was then changed to a full open cockpit with no hood, or a semi enclosed one, (Olegs version) for subsequent aircraft..