We have a stone garage that's suppose to look like a barn. The stone wall (garage) is left wall of front veranda. Stone travels across front of veranda, steps and around house at a certain height (can see in pictures below). Also a few feet up on front veranda (to bottom of fixed french doors).

We were originally going to have stone on lower level sides/back, but it was the first thing to go when we wanted to stay on budget. House is tumbled brick (texture) with a mortar wash. We used stone over all doors and windows. We really like the way it turned out.

In link, scroll down to second house featured - Alabama Armand:

Here is a link that might be useful: Our House - A Jack Arnold Home on a Lake

I love the stone/siding combo of this house - which won a recent award . . . It would also tie in nicely to the hardiplank on the back. It might even allow you to use stone on the main part and siding on the "wings", which would be the most traditional way to do it. . .

Here is a link that might be useful: Norman Askins stone and siding house

We alternated cream colored genuine stucco and oversized cream brick all around the house. For the most part, projections are brick, and recessed portions are stucco.

I'm not sure what you're describing when you say gables would be stone. Any heavy-looking material above something less substantial looks at odds because it appears unsupported. Avoid the 'movie set' look where only the front elevation is impressive -- as though one only sees a house straight-on!