Did a final refresh today and plan on leaving it for a while. Added a few more things like nload and btop (works nicely with kde konsole)
Anyway, this build appears to be definitely usable as a basic firewall when connected to a switch with vlan support or using usb adapters, the wireguard functionality also works, I haven't tested any wireless. The only major annoyance with it is the USB3 port may be limited bi-directionally to 1gbps or so BUT it is reliable with a rtl8153 adapter; which I can confirm can send and recieve simultaneously over 950 mbits/s on iperf3. So I assume it is then capable of routing a 1gb/s internet connection since the onboard nic also is capable of those speeds.
Anyway, this build appears to be definitely usable as a basic firewall when connected to a switch with vlan support or using usb adapters, the wireguard functionality also works, I haven't tested any wireless. The only major annoyance with it is the USB3 port may be limited bi-directionally to 1gbps or so BUT it is reliable with a rtl8153 adapter; which I can confirm can send and recieve simultaneously over 950 mbits/s on iperf3. So I assume it is then capable of routing a 1gb/s internet connection since the onboard nic also is capable of those speeds.