Time to cut plastic so here are the sprue shots. This is the model that will have the engine on show.
The engine kit instructions confused me for a moment, when looking at the sketch showing the panels to cut out it appears to me that they are on the wing panel, in fact the panels that need removing are on the two fuselage halves.
The instructions are misleading with this sketch.
I have marked out in black the outline of the panels that need to be removed on the right hand side, the left hand side is the same.
After the panels have been removed.
A dry fit with the wings installed. After an evening tinkering I think this will have to be presented as a point in the engine change task as only the overwing access panels will be open with the top of the engine on view.