Quantity   Component name
1 × 360mm x 1" x 2" galvanised rectangle hollow section (RHS) The stock I found has 1.6mm walls
13 × 0.8" 16 or 14 segment common cathode display I used the green KingBright PSA08-11GWA
1 × DS3231 RTC (or any other RTC module if you're using your own controller setup)
4 × 3mm green LED These are for the AM/PM indicators and time separator
2 × TPIC6B595D power shift register Common cathode digit sinks
2 × 74HC595D shift register LED driver control for 16 segments
1 × STM8S003F3 STM8 microcontroller to manage the display multiplexing
20 × BCR402W LED drivers LED and segment drivers
1 × LDR (photo-sensitive resistor) (Optional - adjust brightness automatically based on ambient light)
1 × Rotary encoder with push button switch
1 × Atmel ATMEGA88 TQFP (or your MCU dev board of choice)