DIY King YouTube channel is working on a DIY electric bike project. They have the mechanical part and a homemade battery already made. The thing is that usually electrik bike or skateboards are working with brushless motors ant those need an ESC or electronic speed controller with triple phase output. In this case, for their project they are using a DC brushed motor. To control the power for this kind of motor you need a PWM power controller and with this circuit you can control the speed. So, since the battery goes up to 84V and the motor is quite big, they designed a powerfull PWM power contoller for this project. This is the board they've made.
And if you want to order your own boards, use JLCPCB.com
and select your color.