Looks like the back (and side) cover clips on. IFixit has repair guides available already. Inside, it looks like basically any regular phone. No Fairphone-esque modules. The inside seems to be well-designed for repairability though – separate bottom board and battery pull tabs. All of the side buttons are attached to the back cover and a thin cable connects to the main board under some plastic. That’s going to be easy to break while repairing…

I looked at all 3 phones, they are all similarly built to the Pro model I linked.