I would contact a fibreglass boat repair place in Rupert or PG and ask what the average complete transom repair/replacement is and budget it in. Given the holes in the transom and age there is a good chance it will all need to be replaced. I have a friend with a 22 of that vintage here in Victoria but he wants a lot for it, I think he just sunk 7k CAD into the dual axle trailer. His transom looks a lot better than this one.