widodh: I support your letter. According eberhard's infos, I hear such a strong No, for 3ph charging, from tesla, so i guess, software action is not enough, to convince teslamotors.
Why not working on hardware engineering symultanios, to convince tesla, to realise the project together, than without teslamotors.
If there exist a prototype for retrofit the 1ph to 3ph charging, wich can be done in serie, tesla can hardly stay beside.