Laser printer - We need a laser printer (ink won't work) to print the circuit on our glossy paper.Glossy paper or photo paper - To transfer the circuit layout to the conductor board (any magazine paper will work).Iron(III) chloride - To etch the PCB - !ACID! - Amazon.2x 300k SMD 0805 Resistor - Yes SMD we don't have much room - Conrad.Dual Mosfet IRF7319 - Heart of the circuit to switch between on and off state - Conrad.Dual Diode BAT54C - Makes sure that the current runs in the right direction - Conrad.Conductor board without photoresist coating - This will hold our electrical components - Conrad.Momentary switch - To turn the system on and off - Ebay, Amazon (fancy with LED).Since we will etch the conductor board ourselves we need few more things. This will shut down the Pi properly and avoid any SD card damages.
But I recommend using a soft On/Off circuit. It's possible to use a simple switch to cut power.
Mini HDMI to HDMI Adapter - To connect the Pi and the TV - Amazon ( mini HDMI cable is also an option).This basic switch will just cut the power. Slide switch - For a very basic on / off switch.Step up Converter - The battery will give ~3,7V but the Pi Zero needs ~5V - Amazon.Li-Ion charging board 1000mA - Charging board for our battery - Ebay.Blackberry LS1 battery - Our power supply - fits best - Ebay (the height is the critical parameter and should not exceed 5mm).USB Type A to miniUSB Type B adapter cable - Later we will charge from miniUSB- Amazon.5V power supply with MicroUSB cable - To charge the battery - This or this will do it (~2A, 5V).Micro SD Card (4GB+) - This is where our operating system will live - Amazon ( check compatibility).Original SNES Controller - That is how we play - Best bet: Ebay (~15 € is a good deal, be aware of fakes).Raspberry Pi Zero v1.3 - The heart of the build - Provider: PIMORONI, adafruit, PiHut (try to get a kit).