A shield for a NodeMCU devkit V1 ESP32 with NMEA2000 marine canbus (non isolated) and 2 1-wire sensors. Power from 12V NMEA supply converted to 3.3V.
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Yup, that's a circuit board all right. I have no expertise to critique your design, but I'll be interested to see where this goes.
Thanks for showing it. Being plugged in? Any plumes of smoke?
I have no expertise in anything to be honest!! I am just doing lots of research and trying to combine things in a sensible way. The 1-wire has lots of examples online that are very basic and I have seen a few with extra protection and filtering which I have tried to include.
The NMEA 2000 is just a can transceiver and will use the marine protocol. There is a 12v supply in the standard NMEA cables, a ground and the high and low line.
I have used a combination of online examples of similar, once again with some extra protection and filtering/decoupling. I have no idea what the final result will be like but I have purchased an oscilloscope and will Google how to use it!! 
I just had a thought that I might get everything to fit on the same footprint as the ESP32 boards I have and so be nice and neat. I will look at if it is possible to have a multi-stack with appropriate headers so that I could add additional boards with more functionality.
I hope to code it to provide eg temperature data from around the boat over the NMEA network to the multi-function displays but I will also look at using wifi to a raspberry pi signal K server.
Literally months of fun learning about all these things! 
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