Building my own router (x86 -based) - any hardware recommendations?

I'm interested in building a DIY router and would be interested in recommendations for various bits of hardware especially motherboard and case.

I would like to install a 4x1GB Intel NIC adapter and also a PCI-E adapter for a 4G/5G modem with a SIM card slot.

Is size and power consumption parameters to be considered?

As small as possible. A two port NIC would be sufficient if I found a really compact case and motherboard. It prefer it to be powered by an external 12v power supply.

For two ports, get a sw302da (or better) or the APU2 (or better), they come with at least 2 intel ethernet ports, and at least one SIM slot -

Roqos RC150 would check all of your boxes, even comes with a 4G modem, so no work required,
but it's bigger.

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I was thinking about something like:-

I thought that APU2 motherboards were quite expensive.

I have one of these with proxmox running my router and sdn control software.

the 5105 models are quite a bit faster there's some nice reviews of these by patrick from serve the home

the r86s is also worth considering for a all in one router machine.

I thought about getting one of those atom boxes with lots of 2.5 gbe ports and maybe I should have but I ultimately just thought meh and bought a Ubiquiti Switch Flex XG

It seemed a bit pricey but I guess it was still OK considering all the port speeds are covered up to 10gpbs for 4 ports. It was honestly quite bizzare to setup, I have no idea why you'd ever come close to wanting your router config in a cloud somewhere but I managed to set it up locally no problems and although the software isn't too bad I still think a flat web config would have been better

I wasn't able to get port aggregation working with a D-Link DGS 1100 08 bit of a bummer but since I can have openwrt running on my modem device I get to use vlans so I can use ports on that even though I guess it's a little added security risk if it gets compromised so the 1gbps uplink port carries the public and private lans leaving me with 4 full speed ports to use how I like with the only caveat being one of them needs to faciliate access to the switch management if needed

the power adapter broke on me for some reason and although it uses a USB C port for power it didn't actually accept power going C to C BUT as long as you use a good cable going from C to A it works so it can be powered just like a raspberry pi straight off a usb port on a power strip. I currently am using one of these fancy baeus 2 meter cables that have a led display and it shows it idling at 8-9 watts with 3 devices plugged in

despite the annoyances I think the product is pretty good and still kind of lean towards having a server with like 1 fat port and a switch capable of vlans for connectivity rather than an atom device running a full linux with 5 nics in it, but maybe it was the better way to go