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I take it you want to make your own floorboards. In my 51, which has the same sized bed, I used a piece of diamond steel plate for my floor. It was 4ft wide (122cm) and was a perfect fit. Divide that by 8 and you get 15.24 cm..........But are you going to put steel runner strips in between? The width of the part of them in between the boards will decide how wide your boards are.
