stepper motor Nema14, 0.14Nm, Typ A -
https://www.pololu.com/product/1209

Arduino nano V3.0 - 
https://arduino-shop.cz/arduino/823-arduino-nano-v3.0-atmega328-precizni-klon.html

Easy driver - 
https://arduino-shop.cz/arduino/1125-arduino-motor-driver-a3967-750-ma-30-v.html

2x Mini breadboard -
https://arduino-shop.cz/arduino/1424-nepajive-kontaktni-pole-zy-170-w.html

2x limit switch -
https://arduino-shop.cz/arduino/997-arduino-koncovy-doraz-spinac.html

Rocket switch -
https://www.gme.cz/p-r13112a-b

Input connector for 12V -
http://www.wealthmetal.com/en_asp/productshow.asp?id=2086
( Or same socket with this interface. Hole in pedestal is designed for this )

Voltage converter -
https://arduino-shop.cz/arduino/963-menic-napeti-z-12v-na-5v-3a-15w.html

Power unit - 
INPUT: AC 100-240V 1A 50/60Hz
OUTPUT: DC 12V-3A
use the same power source as this one
https://www.t-led.cz/p/led-zdroj-12v-36w-zasuvkovy-5306?artnr=228&sizenr=228&gclid=EAIaIQobChMI9dmwtaai7QIVhbp3Ch1PGg88EAQYASABEgLY__D_BwE

Arduino Joystick PS2 -
https://arduino-shop.cz/arduino/884-arduino-joystick-ps2.html

Code for arduino and information about connection
https://www.brainy-bits.com/post/control-a-stepper-motor-using-a-joystick-and-an-arduino

For your country you have to find equivalent products in your local store.

1x capacitor 100uF
2x capacitor 100nF
1x Linear Taper Potentiometer 50k OHM
2x Diode 1N4148
2x resistor 1k OHM
1x resistor 330 OHM
1x timer ne555
1x MOSFET IRF540N
1x NPN switching transistor 2N2222

PCB files for Eagle 
https://www.dropbox.com/sh/innm891c1pg3ewo/AACK_qNcup237_MAE0SjviCfa?dl=0

Lenght 80cm
Diameter 15mm
Fixed part 20cm
Flexible part 60cm
2 x nut M14x10
Made to order 
https://www.martinasek.cz/en/flexible-pipes