The D-30, D-40 and M all had the small dorsal fin Some earlier models were retrofitted with it in the field.
That control panel is sort of a Hybrid. The shape is of the D-30 and later wile the instrument layout is that of the D-28 or earlier. The rudder pedals are from a D-40 or M. It should look fine for a D-30 of 40 once in the cockpit as I think the shape is the most recognizable part of it.
Something else to watch out for that is noticeable especially if you pose the canopy open is the floor. The D-28 and earlier had a corrugated floor wile the D-30 and later had a flat floor, or rather not corrugated as it was on several levels, Which ever type of floor the model has it as easy to modify it to the opposite types by either gluing on plastic card to turn an early type floor to the later type of adding thin strips to a later type floor to change it to an earlier type. If you need to do this let be know as I have some good photos of both types of floors