A jib crane seems to be a bit overkill to me. Assuming that you will not be attempting to lift more than 100 pounds at a time, a simple boom with a hand cranked hoist or block and tackle system should be more than adequate. You could mount the boom on a vertical wall or on a pole fastened to the deck, so that the boom swivels in over the deck for unloading. Triangulate the boom for strength and make sure your mounts can support the load.
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Is there any place I can get a diagram or simple picture of this design?
Here Is a picture out of an old book I have that shows the basic design. Just replace the large wheel with a regular pulley and use a hand-cranked winch or come-along on the bottom. By the way, for some reason this was called an Irish Crane.
Makes sense to me.