Reverse Proxy Suggestion?

[TukangUsapEmenq]

Hello LTT Forum!

Straight to the point. I have an old laptop that sports Intel Pentium Dual Core P6xxx (forgot the model), and 3 GBs of DDR3 RAM, and now it's just sitting calmly in the shelf. I planned to use this laptop as a little reverse proxy server, especially for Steam downloads (just for 2-3 PCs), for 24/7, as data caps here are albeit unhandy anymore for my family needs, and based on down here:

 

https://arstechnica.com/gaming/2017/01/building-a-local-steam-caching-server-to-ease-the-bandwidth-blues/

http://pathar.tl/blog/steam-cache/

https://steamcache.github.io/

 

Which one is good?

I wanna use Ubuntu Server with the GUI tho.. Or is there's any nice linux out there beside that?

 

By the way either, I'm here using tethering from a mobile phone as the source of the internet. (No more options tho, period.)

Can I actually use the tethering as the source of the internet itself, by using the laptop internal wifi, but the end users will using wired connections?

On the future I could use an access point tho from the switch..

 

Down here, this is the graph of what I mean:

Spoiler

Thanks for ya attention.