Spare parts for a bed frame (?) (Bromley BR2)

We bought a flat pack bunk bed for our kids about 8 years ago. For some reason it came with a mountain of spare wood, and screws, dowels etc. Not sure what happened, my gut feeling is this isn't enough for a whole new bed, but definitely has two sets of side planks. No slats under mattress definitely. Could be a great project. All new timber. We just need the space!!

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