I have only looked at the info for half the teams so far and was able to theoretically assemble this starting lineup:
Rotation: Spencer Strider, Justin Steele, Shane Bieber, Seth Lugo, & Tyler Glasnow
Closer: Kendall Graveman
Catcher: Will Smith
1B: Pete Alonso
2B: Brendan Rodgers
3B: Austin Riley
SS: Willy Adames
OF: Ian Happ
OF: Jazz Chisholm
OF: Tyler O'Neill
DH: Anthony Santander
Total 2024 salary: $171 million against a proposed cap of $191 million.
That would leave $20 million for reserves. I'd also want to leave some room to add in mid-season pickups as well.
That is just a starting point and it seems doubtful anyone would get their hand-picked preferences across the board. I purposely avoided the highest salaries and purposely did not choose any pre-arbitration players. I made these choices in 5 minutes. There are thousands of ways to mix and match. Putting the roster together is simply a process of settling for something less than ideal in one spot to improve others.
If anyone thinks they might be interested, send an email and I'll send you the file I used to select my theoretical lineup. Play with it and see what you can come up with.