Resistors are common 0805.
LEDs are 3528 RGB common anode (CA). Please check if pinout is correct before ordering. The common anode should be on pin 4, the other pins do not matter in which order (RGB, BGR, GBR...) they are. Pin number could be different depending on supplier/manufacturer.
This one has different pin numbering but should fit:
Switches are sold under the name SS13D07G4, these are single pole triple throw (1P3T or 3 position).
Solder LEDs, then resistors, then switches.
Apply between 2.5V and 5V to J1 to power LEDs.
You could 3d print a frame for it.
The bottom frame segment has some space for a custom power supply and a switch.
