I made a castle map!
but the thing is...it's a naval map!
It's the Siege of Bitchuu Takamatsu, where Toyotomi Hideyoshi flooded a whole castle and sent boats to attack the castle before getting the news that Oda Nobunaga got assassinated. The map features the 3-mile dyke that he erected and waterways within the castle!
That said...I actually recommend against steering the boats into the castle, they get stuck in the middle of the waterways in and out of the castle for no apparent reason and I can't find a way to fix that. (Can someone look it over for me and perhaps find a solution?)