Life rafts canisters
They were made the same way as on the Meteor
pic 1 this is how I cut things to the same size
pic 2 I then round the ends in the drill
pic 3 add thin strip of styrene to give it the canister shape just glue one end and leave for a while as they'll come off if you bend them right away
pic 4 finished life raft on the plan they look like almost sitting on the deck hence the little square support platform but looking at a picture of them on the boat they have legs in each corner more rework