1. With the bulkheads mark up half way from bottom to top then along the centre line 6mm either side so it will leave a slot 12 mm wide. Do this on all 8 bulkheads. See picture 1
2. On the keel mark half way down from the top then 3mm either side of the centre lines marked for bulkheads to leave a slot 6mm wide. See picture 2
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Picture 1
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Picture 2
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Step
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