FredyBobJoe

Other than if the machine you are remoting from is unable to keep up with the decoding requirements.

zerotier has clients for almost everything, the app is called zerotier one

It has occurred to me that there may be an easier option as openVPN can be a pain to configure, have you ever heard of zerotier? Here is a basic guide: https://support.paperspace.com/hc/en-us/articles/115004997928-How-to-Create-a-VPN-tunnel-with-ZeroTier-Windows-

A VPN is a good place to start, openVPN could be a good option, you don't need to have a router that runs the server you can run that on something else as long as oyu can forward ports on your router, once you have done that install a client on your phone and create a smb share from your pc. I don't mean to sound dismissive, just ask any questions about those steps.

You could try a remote access software like team viewer, it wouldn't require a VPN but can be a little bandwidth intensive, you said your home internet is good but where will your iPhone be? If all you want is video streaming something like plex may be a good option.

If you are looking for new I believe this is the cheapest full length rack: https://www.amazon.com/Rosewill-Server-Desktop-Frame-Standing/dp/B06XZWJPHG/ref=sr_1_3?keywords=rosewill+12u&qid=1559529470&s=gateway&sr=8-3

Personally, me and my friends all use Noctua, not once have we had a bad fan.