That should all be plenty strong. You didn't buy this boat for a circumnavigation.
What I would do is check carefully again the structure that goes from the side stays (shrouds) across the boat. When you're sailing, the mast is being pushed down (compressed). The stays are under tension. This would squeeze the sides of the hull together if the deck wasn't there. If you are worried about rot in the deck, consider some more reinforcement just under the deck across the boat.
In your rigging check, look at every bolt and screw. The stainless is old enough that it could be eaten away by crevice corrosion. Also look carefully at the spreaders where they attach to the mast.
It's great you've got the rig tuned. If you need a guide, Selden has a good one (called Hints and Advice")
http://www.seldenmast.com/frameset.cfm?id=6740&randnum=350440768
What I would do is check carefully again the structure that goes from the side stays (shrouds) across the boat. When you're sailing, the mast is being pushed down (compressed). The stays are under tension. This would squeeze the sides of the hull together if the deck wasn't there. If you are worried about rot in the deck, consider some more reinforcement just under the deck across the boat.
In your rigging check, look at every bolt and screw. The stainless is old enough that it could be eaten away by crevice corrosion. Also look carefully at the spreaders where they attach to the mast.
It's great you've got the rig tuned. If you need a guide, Selden has a good one (called Hints and Advice")
http://www.seldenmast.com/frameset.cfm?id=6740&randnum=350440768