Alright so, lately I’ve been thinking about a framework AIO desktop for a while now and had only made plans for it since I don’t have any resources for the actual building part. But would it be technically possible? My plans is to build something that has a build quality like the iMac yet the repairability like a FW Laptop. My plans is to put the mainboard right into the stand thing idk what it’s called the little rectangle thing to stand the AIO and would it be possible to cram a mainboard connecting to a dongle that stick out to have all the ports into one place and to connect to a pcie slot inside of the thing and have a low profile maybe 4060 idk. I’m worried about the cooling situation though. If I sound like I’m talking straight gibberish maybe I am I have no experience with building a computer. So I’m still trying to figure things out before I actually start working on it but I am currently in a situation where I can’t actually do it so maybe it’ll be out for a long while. 
Here’s someone who already made one, so I think it’s possible for sure. There are also people who have already made pseudo-all-in-ones already by sticking a mainboard onto the back of a monitor. Similarly, someone is working on a 2-in-1 here.
You might be able to easily modify an off-the-shelf monitor if it has enough room in the back and then cut a few holes in the chassis to install the USB-C ports to extend to the outside (plus a power button, see Input Connector Shim for a way to do that).
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