I went a different route on adding a ladder to the platform. This one lays on top of the platform, simple to make, and it's portable.
My wife loved the ladder we had on our Yamaha 212X and hated that we weren't able to have one on the Kaiyen.
The wood is flat 1/2" oak from a neighbor's staircase that he was replacing. I used two stainless steel hooks to attach to the grab bar. It works great and received the wife seal of approval.
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2022 Kaiyen
2020 Yamaha 212X (sold)