I am slowly moving towards making a planetarium of my own. Was able to get the dome done using PVC pipes. I’m figuring out the best way to put a screen that’ll be somewhat strong, smooth and good enough to project upon. Biggest hurdle is getting a particular fisheye lens that is suitable for the purpose.
I’ve set up tailscale in the past week and fallen in love with the ease of use. So, this has my vote too. But, if i was doing this, i would chop the file into, say, 500mb parts using 7z or WinZip and then transfer it through SCP (WinSCP if using windows) over tailscale IPs.