Sit the entire feeder set-up, just the way you have it now, inside an open topped box or crate set longways on its' side. If the sides are wide (tall) enough to cover the feeders, then the top (the other side) will be wide enough to keep the poo out of them.
If you calculate the width of the bottom (now the back) correctly, you can still get in to fill the feeders, but the girls can't climb on top - or you can angle the top, like a coop roof, so they don't roost at all, but you still have access. If you plan to use a heated base in the winter, leave off the lower side, so the heater doesn't sit on wood all winter and be sure to allow for the additional height.
A bonus is that Mr. Contractor can't get the hose past a wooden box without making a serious effort!
If you calculate the width of the bottom (now the back) correctly, you can still get in to fill the feeders, but the girls can't climb on top - or you can angle the top, like a coop roof, so they don't roost at all, but you still have access. If you plan to use a heated base in the winter, leave off the lower side, so the heater doesn't sit on wood all winter and be sure to allow for the additional height.
A bonus is that Mr. Contractor can't get the hose past a wooden box without making a serious effort!