[Core p7 extender in a core p5]

Hello, can i put the core p7 extenders in a core p5 or i have to use the central section of core p7 too?

[Motherboard E-ATX on core P5?]

Hello, i Will buy the New Amd Threadripper and i like The X399 Zenith Extreme Asus 

This motherboard is E-ATX and my case Core p5 say "Support Only ATX". But Online i have seen Many Pc with Zenith Extreme on Core p5. It means that the Thermaltake Core p5 Support E-ATX too?

Thanks, Simone 

P.s Sorry for my English, i'm italian