buddy press and a studiopress theme

[excel]

Hi
I bougth the Elle theme.
I am using wordpress multisite.
The main site is Buddypress with for the time beeing the standard Buddypress theme
All child sites will be implemented using the theme Elle.

So I also should like to have the main (Buddypress) site implemented withe the Elle Theme.
Question how to adapt the Elle theme for buddy press (for the main site), and I hope that I will have no problem using the Elle theme for the children sites.
I tried to use Buddy Press Template Pack, but I was unable to follow the procedure and I preferred not to alter any studiopress files.

Thanks for your help
excel