Hello,
the problem with the drilled Zimmermann discs is that the drilling was done after the casting. That means they can get cracks when they get too hot. So i wouldn't recommend to aggressive brake pads in that case. The GT3 ducts will help, but if you combine these brake discs with too aggressive pads you'll run into problems.
If you have high quality discs where the wholes were done with the cast and afterwards drilled there are less problems with very high temperatures. But these discs cost a lot more.
Braided stainless steel brake hoses: there is a manufacturer over here in Germany who hold the patent for braided braided stainless steel brake hoses with an inner teflon sleeve. They also have an ebay shop:
http://stores.ebay.de/Fabian-Spiegler-Bremsencenter-UG?_dmd=1&_nkw=porsche+986
Shure there are other companies in the US that do good stuff.
I would recommend DOT 5.1 brake fluid instead of DOT 4 brake fluid. It's compatible withe the 986 brake system.
Regards, Markus