I am in a somewhat similar position : I want to build a linux distro powered phone (postmarketos and/or ubports should be able to boot), and I have no idea wher

I am in a somewhat similar position : I want to build a linux distro powered phone (postmarketos and/or ubports should be able to boot), and I have no idea where to start. Maybe I'll start by booting up the OS on a raspberry pi and get all the components working on a brick sized prototype and then see if it's possible to use the pi compute module to use as a base for the phone. Any ideas/suggestions are welcome.