So you are looking for an open source laptop with DIY expansion support? The GenBook RK3588 is worth a look. It is powered by Rockchip’s RK3588 with 4 x Cortex-A72, 4 x Cortex-A53 cores, and 4 x Mali G610 graphics cores. It can connect to 3 displays at the same time. This laptop is modular and upgradable. You can order this with up to 32GB RAM and 64GB eMMC storage. It also has a full HD 60Hz display.
The GenBook RK3588 laptop has WiFi 6 and Bluetooth 5.2 connectivity. It lets you add a M.2 2280 NVMe solid-state drive to expand your storage. The neat part about this laptop is the fact that you can easily upgrade and repair its display and other parts. It has USB 3.2 Type-A and C ports and a full-size HDMI port. You can run Android 14, Debian 11, Ubuntu, and other Linux flavors on this.