I saw that video recently and it does not include some things that made me stay away: labor cost, expertise and parts availability. - I cannot buy all the part

I saw that video recently and it does not include some things that made me stay away: labor cost, expertise and parts availability. - I cannot buy all the parts where I live (Eastern Europe) and not for the price in the video - I am decent with a soldering iron and quite ok with a screwdriver and power tools, but welding live batteries is out of reach for most people - it takes quite some time to do that work, not included in the $650 - I would like to modify that setup by adding more batteries or different batteries (like big motorcycle Li-Pol batteries), but I don't have the expertise to change the setup and I have no time to get that expertise, it is not something you learn in a few hours So it is a good proof of concept, but not really something to mass replicate by people at home.