Hoverboard to ebike conversion

My son had the crazy idea of using his old hoverboard to make e-bike with his small childhood bike
Video of it working here https://www.youtube.com/watch?v=-ZQxsT7qDhU

You will need
Battery
https://www.aliexpress.com/item/1005007255255358.html?spm=a2g0n.order_detail.order_detail_item.3.6370f19c1Gin2X&_gl=1*1ymtna5*_gcl_au*MTU2NDYwODg1LjE3NjEzOTcxMDI.*_ga*MTUwNTg4NTk5LjE3NjEzOTcxMDI.*_ga_VED1YSGNC7*czE3NjIyNDgxOTkkbzYkZzEkdDE3NjIyNDgzNDQkajE2JGwwJGgw
Speed controller
https://www.aliexpress.com/item/4000143351840.html?gatewayAdapt=nld2glo
Momentary switch for electric break
https://www.aliexpress.com/item/1005009675327555.html?src=bing&aff_short_key=UneMJZVf&aff_platform=true&isdl=y&albch=shopping&acnt=135095331&isdl=y&albcp=555190543&albag=1304021950430056&slnk=&trgt=pla-4585100935181475&plac=&crea=81501428383613&netw=s&device=c&mtctp=e&utm_source=Bing&utm_medium=shopping&utm_campaign=PA_Bing_UK_PLA_PC%2FM_LBFC_gb_bing_gxpc_MaxValue_20241125&utm_content=gb_bing_gxpc&utm_term=12mm%20Pus