Between the port forwarding and security and other kinds of hassles of running a server in your own house, I just used digitalocean hosting for a minecraft server for my kid a few years ago, $5 a month. Here's a script to install the Cuberite version mentioned in the article: https://github.com/cuberite/cuberite-ocean

Now there are free services like Gamocosm which shut down your digitalocean server when not using it, so that it might only cost $1 or so a month: https://gamocosm.com/ Meaning it would take 8 years before it cost as much as a Mineserver box.