I know that there are many difficulties in galvanizing a car chassis but it has been done. Check this:
http://www.matra-bagheera.com/Plan/Resto/Galvanising/galvanising.htmlAt this year’s international Matra gathering in Germany I saw two Bagheera II build on galvanized chassis (the two cars had the same owner) The two Bagheera chassis was galvanized by Matra as a test before starting the Murena production. The two Bagheera chassis were later sold as spare parts.
I had my cooling water pipes for the Murena galvanized last year, when I collected the pipes I asked the workshop manager if he would undertake the galvanizing of a complete chassis, but he would be very reluctant to perform that task due to the risk of things going wrong.
Hans