A well built boat is always stronger than the crew. The maxim of 'one hand for the boat, one for you' is a good one, but not always enough.
I learned on board my first submarine, and had re-remembered on my last ship, a USNS T-ATF that the first thing you need to do is put straps in your bunk. I got that advice from a salty E-7 who showed me my rack; top most of a four layer stack of racks, a 22 inch wide, 22inch high by 6.5 ft hole five feet off the deck. I literally could not lay on my side because my shoulders were to wide, you lifted yourself up and slid in horizontally.
I fastened 2 inch wide straps at chest and feet to hold me in case of lurches, I'd had sea stories of guys being bounced up and out in a Fred Flintsone like shuffle. As if sideways out wasn't back enough on submarines a serious bow up/down movement can send you falling straight onto your head/neck and still be in your bunk.
The Officer in Charge I replaced on the T-ATF was med-evaced off because as he laid in his bunk with his head facing the bow and he was literally lifted, rolled up and tossed onto his head while still in his bunk by the plunge after cresting a simple 15 foot wave (boat was rated by the CG for 12 ft seas).
We Sailors call them lee cloths, but I'd go a step forward, and put an actual strap in. It'll take some getting used to, but is a whole lot more comfortable than a neck brace for months or a hole in your forehead.
Likewise through out the boat, plan where you have to walk, understand that it's not an exercise in monkey bars where you can swing left hand/ right hand etc. One of those hands will be full of something, you have to be able to do it with one hand so adjust those handholds to that concept.
If you think you can hang on that 1 inch fiddle as a hand hold, try it once at 45 degrees heel and a bow plunge and see, then replace it with a real hold.