A thought only on height: I often sweat a line and to keep that option open you'll want the belay point as low as practical. I find that about knee height is good as that's high enough for an easy reach, low enough to sweat the line, and high enough above deck than you can hang the coil on the pin and low enough that the coil is not subject to undue blowing about. If you put the pins out on the shrouds, you need to get high enough that your hung coils don't get swept away as the boat heels and goes through a wave. Usually about waist high does it but you might go higher to be away from the lifelines. If you'll need to sweat the line, put a hook on the convering board at deck's edge below and lead the bitter end back up to the pin rail.
G'luck
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