As an experienced D&D player I can tell you this: Sandboxes are awful. Without any evident goal, a party will dissolve, since there is no reason for them to stay together. You need a plot, or at least a metaplot, in order to have a game. Also, you're keeping track of way too much for the players. Have them keep track of their own money and status effects. There's no reason for DMs to kill themselves every game.