Thank you Smidge204!
The part arrived in the mail today. Looks great. Fitup with the J-plug is good; plug snaps in place with no interferences. The screw hole sizes and screwdriver access are good also.
Here's some photos showing fitup with my J1772 plug (manufactured by ITT)....you can see that the part was printed with honeycomb infill...
If mounted to a wall, the J-plug handle points straight down.
You can see in this photo, it's not a tight fit. Printing tolerances make this difficult to size precisely.
My J1772 has a foam gasket seal around the outside of the plug. When connected with the part, the gasket is barely compressed. Not sure if other J-plug have this feature.
Haven't done any destructive testing, but the part looks to be strong enough. Only design change I'd make, is to shorten the tube by a few milimeters.