Like this? https://www.cnx-software.com/2021/08/10/mincab-smallest-raspberry-pi-cm4-carrier-board/ https://www.cnx-software.com/2021/08/10/mincab-smallest-rasp

Like this? https://www.cnx-software.com/2021/08/10/mincab-smallest-raspberry-pi-cm4-carrier-board/ https://www.cnx-software.com/2021/08/10/mincab-smallest-rasp... That's pretty small! But the point of the CM carrier boards is that they're completely dependent on what IO an individual user wants. For some, that's dual Ethernet; others have no idea why you would want more than one Ethernet port. Still others don't know why you would want any RJ45 at all: they don't have Ethernet throughout their house except between the modem and the router (if those are separate devices!). They'll just plug a Wifi dongle into the USB hub. As a carrier board designer, you've got to ask this question for everything from ADCs to Z-Wave wireless. The Raspberry Pi carrier board just included all the defaults provided by the connector, with minimal external components. Also, they did it with a 4-layer board and open-sourced the Kicad design files; if you want a subset of it you can make it!