Be advised, that little rubber gasket that surrounds the roof pin receptacle (shown in the pic above) is a special order part, heres what you are going to need:
Rivets X4
Rivet Caps X4
Aligning Seal (prevents water from running in here) X2
Speed nuts (probably the most crucial to putting everything back together) X6 (2 extra, just b/c you cannot get these just anywhere, and they are in numerous places on your car)
I recommend Evercoat's Metal to Metal as probably your best and only choice for leveling on the targa bar. You cannot really use a dolly on it unless you just have some really nasty indentations you want out.
Powdercoat the thing if you want the best finish, or
SEM Hot Rod Black is a great OEM looking finish too.
Aircraft grade paint stripper will get it down to bare metal but will be messy, or you can get it soda blasted, or hell--just spray paint the thing on the car!
Other threads detail what kind of rattle can products you might choose to use.
Good luck, and shoot some pics when you are through!