A few impressions from building my musical suitcase:
An old-style flight case.
Spare ply wood
Screws and Glue
Copper tubes for bass-reflex
House covers for lamps
Mini car amp (Lepy L808, 2x10 W)
Old speakers from a compact stereo set
Source 1: Lead-Gel Accu (12V) and
12V-Charger for the Accu (can be hooked up by connecting it to two large machine screws in the center opening).
Source 2: 3A/13.5V Power Supply when a wall socket is available.
Switch for switching Battery and External Power
Voltage Indicator: Analog Voltmeter (0-15V)
On-press switch for Voltage-Indicator
Various cables, connector clamps and soldering lead
Big Screws as contact for the battery charger
Extensions (not shown)
Power upgrade: 2.1 Amp (Lepy LP168S, 2x 20 W + 45W)
Subwoofer: Additional 14cm speaker in an external casing, banana-plug suckets and plugs for connection
Improved Voltage Indicator (10-13V): Analog Voltmeter (0-3V), Voltage regulator (L78S10 and capacitors)
USB Bluetooth module (charged by Amp output)
Hand and automatic saws
Triangle and Band Grinding Machines
Elecrical testing equipment
Battery charger for 12V lead battery
Various everyday tools, like hammer, pincher, screw drivers,..