Quantity   Component name
4 × Old Hoverboard (for the wheels & batteries) (you can find broken one for around 20 buck on ebay)
4 × 400x20x40 aluminium extrusion https://www.systeal.com/fr/profiles-aluminium-6-mm/1226-profile-aluminium-v-slot-20x40-fente-6-mm.html
4 × 16kg Spring D1.8mm L62mm
8 × 6206-2RS 30 x 62 x 16 mm bearing https://www.amazon.fr/gp/product/B07LD1D94T/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
100 × M6x70mm screw https://www.amazon.fr/gp/product/B0953HFFKT/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1