Cable routing on mountain bike.

Rebuilding a pretty much stripped frame, it looks fairly simple, but so far
I've only got as far as buying the cable. Some guidance would be handy
before I start cutting..........

An email to the manufacturer went unanswered and Sheldon Brown doesn't get
that specific on cable routing. Google wasn't much help either.

Its the cable layout that runs in a plastic runner under the bottom bracket.
The bike I'm using has all its cable runs along the top tube.

Thanks for any help.