The parts list for Sol 2 is a bit different:
Set of PCBs: Left and Right switch and LED PCBs
Plates: Either 1.6mm or 4.8mm
Includes standoffs and screws
Full Hand comes with separate PCB
Switches 68-74 depending on layout
2u Stabilizers 0-4 depending on layout
Type-C cables, 3A recommended
Optional rotary encoders or OLED panels
Make sure to locate your OLED and encoders correctly:
Configure the DIP switches according to the guide on the LED PCB
Flash the board according to the Sol 1 guide page, but make sure to use the rev2 configuration
Test the PCB switch holes
Place switches into the PCB through the plate. Test your keycaps to make sure everything fits with your layout
Don't forget stabilizers!
Solder your switches into the PCB
Install your screw hardware as follows
For Gasket Mount: From top to bottom: Screw-Oring-Plate-Oring-Standoff. A stackup view is shown below
Tighten the screws so that the bottom face of the screw is flush with the top face of the plate
For regular plate: Screw-Plate-Standoff
Place the LED PCB on the bottom, and screw it on.
Place your case over the keyboard, and screw it on from the bottom.
Install your keycaps, and plug it in!