The mission to create a canbus demonstration mock up continues. 

This time Its a 2-ch CAN HAT attached to a rasp pi4. 
Finally the Pi4 price has been reduced and a 8meg unit can be had for 130, coupled with a 10in display and the CAN HAT this comes in on the high price side but then again the Pi can be used for other projects

https://www.waveshare.com/wiki/2-CH_CAN_HAT

SUCCESS:  This method to construct a working solution, following the provided instructions provided by the manufacture. Yes it got difficult but it was successful in the end and didn't take more than a couple hours

This success was partly because the PI4 is so much faster than the pi3 that having the internet connected and using the terminal together made this a cut and past routine. There were a couple errors but I just drove on past them and in the end the board was recognized and then transmitted from one bus to the other