The 310 comes with only a single wooden handhold mounted on the plywood partition on the port side near the companionway. I would like another handhold, stainless steel perhaps, on the starboard side. Anyone have experience on where and how to mount a side or overhead handhold? Is the door frame strong enough? (I presume the need to drill a 3/4" hole for access to secure the bolts for the handrail and use plugs or a cover for the holes placed in the head or interior liner).