Some polypanel base plates for prototyping. You can get the breadboards/PCBs used here from your local electronics supplier, and of course from ebay/aliexpress/banggood etc.
This set currently includes:
base-mini-breadboard-170 for 170-point mini breadboards.
base-mini-breadboard-170-notch for the breadboard variant that has notches on the sides.
base-proto-70x30 for 70x30 mm prototype PCBs. Use M3x5 to M3x8 nylon or metal screws to attach the board (when using nylon screws, you can use a metal screw to pre-tap the threads).
The potentiometer panel is from this object:
The simple 555 circuit in that picture is used to control a 9g micro servo (outside the picture), mounted with panels from:
For more on polypanels, see makeanything.design/polypanels.