Let me just throw this out there Paul- try geese instead of rabbits. Now stick with me on this.
My experience with raising geese over the years is that they never seem to touch trees, but will spend their time eating grass and, here's the best part, what they don't eat they trample down flat, all the while pooping on everything. Trust me, there wouldn't be a vole in that goose pen. Simple fences always kept mine in, way simpler then rabbit fencing, kids wadding pools filled with the garden hose supplied the water, I never lost one to predators after the grew up, they great guards, and hardy-tough animals Just one word of caution, be very, very carful walking around in the goose yard. Those noisy guys are sneaky, when your not looking one will sneak up behind you and nail you in the upper thigh or buttocks, (personal experience there

).
So here's the plan- go into the goose business, get that forest started, then have a going out of the goose business sale.
Ain't farmin' fun