Definitely something to consider. Plus, I hate throwing that stuff away when it doesn't work out. If you do go with a feeder design like the second one, I would go with a good ol metal feeder. Same idea, but its metal. If you ever switch feeds, or feeders, than you can still use the metal tray...
Both of those feeders seem good, I would keep in mind feed capacity, and size of the holes. How big are they? I think it would work, but I would wonder about waste. If the holes are fairly small, they might scratch/knock feed out of the holes with their beaks and waddles. It also only holds 6...