I started working on a Vassal module. It's been a while since I've wanted to learn how vassal modules are created, so I dived right into it :)
Here's the link: http://decktet.wikidot.com/local--files/introduction-to-the-decktet/decktet-vassal (from the wiki itself).
Right now it has 2 player sides (red and green) with their own hidden player hands plus the deck on the table with a discard pile.
I guess it's possible to save different setups for different games, but right now there are none. Still, it's not that hard to create a setup from scratch, as you can select cards from the deck manually, or shuffle and deal randomly.
I'm sure there are vassal features I've missed, and other things that could be used too, so please, feel free to comment, suggest, or post any tips or ideas.