Nice looking game!
Last year, Justus Pang put out a request for fishing games for the Decktet on BGG and created Blulu. I also developed a fishing game at that time. Badger's Court (great title & theme btw) uses a lot of the same ideas I did. I particularly like the way you incorporated builds into your design. This is something I want to do, but haven't yet been able to make work in a satisfactory way.
Where our games differ is that mine focuses more on the unique structure of the Decktet and is thus suit driven, with the numeric ranks playing a more secondary role. The starting point for your game is Casino, whereas the starting point for my game is Scopa. Unfortunately, mine must use the Pawns or Courts to function. Despite this flaw, I think there is some good stuff in it. I'll try to clean up the rules a bit and post it here in the sandbox at some point.
Thanks for sharing your design. Very inspiring!