Pretty simple. Pick a team that had a winning percentage of .499 or below and twist players from that roster.
Use baseball-reference for full list of players. Twist to any season of their career. NO AAA NO CLONES NO WW NO TRADES YES DH $110mil Cap. Use stadium of the team from that year. Claim your team here in the forum. Only one version of each team. Divisions will be realigned as close to real divisions as possible.