Thinking of creating a local media center for my home. Any ideas/collaborators?

With the growing fragmentation of online streaming services, I'm thinking of setting up a local media server for my home that I can use over Kodi to stream movies/tv shows to my chromecast. I might go Monkey D. Luffy for the content itself.

Basically the basic plan is to have some base features and some add-ons as follows.

Base:

1. Create a media server using a Raspberry Pi and some storage to serve as the base for all my viewing
2. Setting up Kodi on all relevant platforms to consume data from (1) [This should be trivial]

Add-ons:

1. Create a python script to check for new episodes of any existing show available on the net (Imdb, moviedb, wiki can be starting points to check this)
2. Automate download of shows from 1. Can be setup to run at some daily interval
3. Download subtitles for shows from 2.
4. Maintain some Github list to add new movies/tv shows that user might be interested to download. Script from 1 should be able to consume this.

I used Popcorn time was a software that was able to do most of this at some point, but I remember reading that there were some security issues identified with it. I never really checked it afterwards, but happy to be corrected if it's reliable.

Edit: Thanks folks, I did not know that the RR-sphere already solves most of these problems, will look into it. I was looking forward to the scripting, but I'm guessing these solutions handle security much better than I would at my end.