- Cut the doors to the same length.
- Sand the doors.
- Place the doors on two rafters, length against length, sheet side down.
- Make a joint along the length of the doors, then glue them in place.
- Cut 4 battens to form a frame on the panel.
- Sand the battens.
- Putty the width of each batten and glue it to the underside of the frame, against the sheet metal, using clamps. Don't over-tighten to get the right thickness of putty (>1mm).
- Let it dry.
- Turn the frame over onto the rafters and seal the inside and outside of the frame and between the doors with putty.
- Smooth the joints with a finger. To make sure you don't "dough" the joints and get putty all over your fingers, dip your finger in soapy water regularly.
- Let it dry.
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