At this point, I just wanna know if it's possible inside of Ren'Py.

I would like to add a screen that players will automatically be routed to after a certain number of chapters have been reached in my game (I'm thinking 3 or 5) that essentially serves as an automatic save point in the game. After every chapter, the player will be routed back to the chapter screen, the game automatically saved, and the next chapter is available to play (with the previously played chapters rendered unable to play again).

I would like to make the previous chapters re-playable, but I don't think that would be possible (especially with certain choices giving certain outcomes at the end of the game), so I'm gonna skip trying that for now until I'm more confident about not breaking my game.

I know adding a screen like this would need image buttons, true/false statements, automatic save codes, etc. I'm just curious to know if it's actually a possible (or even just worthwhile) thing to have in my VN. And, if anyone has implemented such a thing before in their own games, was the coding especially hard and did you believe it to be worth the time and effort to create?