There's the two internal vent tubes with the BT-50 main tubes glued to the outside.
So the ejection charge goes up - turns left - then turns up again to blow out the parachute. The tube on the right side doesn't have a parachutes.
Look close to see the glue line down the side top and bottom plates. See the picture below for positioning.
These really add to the strength of the whole unit.
On the left is the top plate. There is a long notch for the engine hook movement.
On the right is the bottom plate. There are cut out panels that will be covered with thinner cardstock pieces. This might have been done to reduce weight on the back end. Down the middle of the bottom plate is a pencil line for the launch lug positioning.
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