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In one of your photographs it appears that the exterior lip of the brass drain tube is missing. It also looks like the rivets have popped that fasten the HIN plate. The weld line separation on your boat is not of major concern; I have seen much worse weld line separation with gaps of one half to three quarter inch wide, 6-8 inches in length, bilateral. You should wait until the spring and warmer temperatures (above freezing) to remove motor and repair. You will need warm temperatures anyway for the repair material to cure. Cover the boat and keep it dry for the remainder of the winter. Elevate the bow of the boat so there is no standing water in the rig tunnel.