Scott, I personally would give the galvanising a miss. You are far better off using a good paint system, ie good primer, paint through to clear coat. Done properly you end up with a nice thin layer of paint which is relatively flexible, ie body panels move without craking the paint.

Galvanising has draw backs for automotive panels. First the deposition thickness is a lot more than the paint, and then the paint on top, adds weight and gives greater risk of paint failure. Galvanising is also added weight, and it it is softer than steel. Also if the galvanising is scratched through and steel is exposed underneath then you get very rapid corrosion (ie rusting).

Just my opinion.
Justin