Impressive setup, but I would assume it to be very operations-intensive because of the high number of deployed components and their complex configuration. Plus, if you are serious about self-hosting, you would need the facilities and infrastructure to deploy it: server rack, redundant power supply, smoke detectors, fire extinguisher... I would never let my PC-grade hardware run unsupervised in my home. And if I understood correctly, you would still have to have some server on the Internet for running your Headscale VPN, so you need your own dedicated Internet connection - ADSL, dial-up, cable modem would not be enough.