Any suggestions to customers who purchased barebone Mini PC and install storage, DDR, WIFI by themselves?

For HDD----User should pay special attention on the HDD size, and thickness, besides if the capacity exceed 1TB, also need to pay attention on OS and HDD portion format;
For RAM---- mind the DDR versions and the voltage (only 1.35V DDR available), and DDR capacity limit of the motherboard;
For WIFI------only one mini pcie slot, once it installed WiFi, no space for SSD, vise versa.