Anyone here wants to do a Dead of Winter mod with me?

I can provide you with the images.

Do you mean the Civil War Battle of Murfreesboro sim by GMT or the “other” Dead of Winter ?

If the former, there already is a module for that one.

Dead of Winter A Crossroad Game

After seeing this game on Tabletop, I’d love to play(test) it. never worked with vassal scripting but might take a peek at it to help you. (I don’t own the game, however.)

Do you know how to code?

In various languages.