...boot???? probably wont fit the driver but will my 3 iron and hybrids fit in the pencil bag and in the boot.

If you're up for a sport car. Drop the Z3 and go for the Z350 Nissan. More fuel efficient and far better ride than the Z3.

Doesnt matter the model. 2004, 2005, 2006. all the same just little tweaks added to the car each year.

There're special boot mounted rack designed for the Z3 to carry your full golf bag.
http://www.cargogear.com/OneItemInfo.aspx?partnum=SUSSRACKB

I don't think you can fit anything that big into the boot... except maybe a couple bags of groceries.