Clip out the bottom and top frame.

Glue them to one another.

Add the feet.

Choose the kind of ammunition you wish to use.

Line up the slots on the frame.

Press and glue into place.

Only the firing handles remain.

Choose a pair of firing handles.

Glue them in place.

Use the spare ammo bits to make a diorama.

Onto the crew. Start by adding a base.

Choose a pair of arms.

Glue the head in place.

Add a second crew member, and you're done.