Hi Jpv!
The Zagato belongs to my dad. You better hope not to need body panels. If you are lucky you get some NOS parts, but they are very very rare and expensive.
Our Zagato only has a alluminium engine bonnet. The rest is steel (even the doors). Zagato built randomly cars with steel or alluminium doors (some cars are said to have one in steel and one in alluminium
)
But our Zagato was the daily driver of my parents for nearly 20 years (1978 - 1996). Now its retired...
Regards Clemens