I think this genius belongs here in knowledge

[sojournermike]

https://www.instructables.com/How-to-Build-a-Longtail-Cargo-Bike/

[Nelson Longflap]

Thanks for that ... such a fine job using basic/home-made tools is really impressive. 

Your genius led me on to this genius: https://www.instructables.com/Turing-Pattern-Bike-Paint-Job/ showing an amazing blend of research, skill and creativity.

[DuncanM]

Such a fine line between Knowledge and Skip bike and bodge it.
The paintjob is great, and the math/computing to create the mask is amazing.
I'm not sure I'd be happy with a cargo bike made from random tubing of unknown origin stuck together with a basic ARC welder, but if it works...

[Gattopardo]

https://www.instructables.com/How-to-Build-a-Longtail-Cargo-Bike/

Arc welding on to an aluminium frame would be interesting.

As well as getting a decent weld joint.  That could be just me tho.

[mzjo]

I am voting for this one! A project on Instructables that does not involve a conception in CAO 3D, a lot of computer controlled machining and 3D printing and a bank of Arduinos to be programmed deserves all the votes it can get, all the more so when it's useful and improvises with everyday tools (eg no TIG or even MIG just an old fashioned MMA)