Hi, just FYI the SSD is not a Samsung EVO, as I have found at least the 970 EVO Plus does not work. It might draw too much power, but the real reason is unknown. IIRC it also doesn’t work in the Pinebook Pro.
We ship Transcend MTE220S (1TB) and MTE110S (256/512GB) NVMe SSDs which work well in MNT Reform.
And yes, power supply and batteries are included with the DIY kit, as well as a 32GB MicroSD card with full size adapter. The Wi-Fi card (Compex WLE200NX) is an optional add-on.