You have some options here. You could hang the boat a little lower, as though it's about to be put in the water (or has just been lifted out). That would give observers a better view of the ship's transom. Or you could leave it as you have it now; that would be a common arrangement when the ship was in harbor or otherwise sitting still. When the ship was at sea, the boat would either be stowed amidships with most of the others or rendered immovable by a pair of ropes or canvas straps called gripes. These could be set up in various ways. I've seen contemporary pictures with the gripes, one near each end of the boat, apparently secured to cleats inside the ship's taffrail. The gripe runs from the taffrail, under the boat, and back to the taffrail, where it's hauled taut and belayed. Another arrangement was to run the gripes diagonally under the boat - each starting at the outer end of one of the davits, passing under the boat, and belayed on the taffrail near the inboard end of the davit.
Here's the description of rudder pendants, from James Lees's The Masting and Rigging of English Ships of War, 1625-1860. (It's reasonable to assume that American ships and British ships were similar in such details.)
"Chains were shackled to eyes in the rudder, coming up each side of the rudder to under the transom. To the end[s] of the chains large rings were fitted and into these rings were hooked the rudder pendants. These pendants had a thimble in each end with the hooks set round the timbles. The hooks were moused. The pendants were seized to eyes or hooks set under the transom - one by the side of the rudder post, one half way along, and one under the quarter cgallery. The end[s] of the pendants were seized to the after end of the mizen channels. When required, a long tackle was hooked in the eynds. The fall hooked to an eyebolt in the mizen chains and led in through a port."
Mr. Lees tends to over-generalize a bit sometimes. I've seen contemporary illustrations in which the whole arrangement was made of chain, leading just about the way he describes: from an eyebolt in the rudder, seized to a pair of eyes under the transom near the rudder post, another pair of eyes halfway out, and yet another pair under the quarter galleries. In any case, the chain needs to have just enough slack in it to let the rudder swing.
Hope that helps a little. Good luck.
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